Alright, time for some homework. Sorry for the long list.
So happy to see caster gear getting some recognition here! Yay! Ty kobey! (and you're right ... a separate caster skin list might be too tricky to manage)
Some things I think are rare to add to your list ...
Avian Axe
Spiky War Hammers (inscribable versions exist)
Kournan Defender (comes in strength for sure, I have a pending bid for 60k on my r9 str 30/5/20)
Sea Purse Shield (comes in tactics for sure)
Tribal Shield for Paragons (different skin than for warriors)
Goldleaf Defender for paragons (see A LOT fewer of these than the Aureate Aegis. I have one in command. Don't know if they drop as motivation, too.)
Skull Longbow
Bladed Recurve Bow
Spiked Recurve Bow
Gothic swords and serpent axes are dropping in inscribable versions now.
Ok, here's the caster stuff I can think of that seems very popular or at least semi-rare. Some of it may not be worth the trouble to list because of very low demand/price.
Dead Scepters (soul reaping Necro wand, haven't seen but a couple, not too popular)
Spiral Rods (curses Necro wands, haven't seen many of these either)
Bone Spiral Rods (death Necro wands, supposed to be VERY rare and desired by MM's)
Wailing Staves (death necro staff)
Boneclaw Staff (another death necro staff)
Pyrewood Staves (fire magic staff, think it's a semi to fairly rare skin)
Dead Staves (troublesome because they come in many different reqs for different caster classes, but it's the same skin that was very expensive pre-NF b/c they only dropped from undead.)
Holy Rods (the gold ones aren't exactly rare, but in demand b/c unlike the collector holy rods, the gold ones can be dyed.)
Divine Staves (both in DF and healing reqs, haven't seen a prot req one yet. I think healing is more rare than DF req.)
Portal Staves (already up, but they come with different damage types, fire, earth, cold, lightning. I've seen people looking for a specific damage type. Someone wtb a fire dmg one for 50k)
Voltaic Wands, energy storage reqs, seems at least semi rare
Crystal Wands, I only know of inspiration reqs, seem pretty rare
Metal/Canthan head water staves, too
"talon" or "claw" grim cestas (death req offhand for necros, I have a req 9 with 20/20 mods on it. The high bid is 100k right now, but I think that's somewhat of a fluke with a few MM's fighting over it. Target is probably 50-70k.)
"medusa" skin accursed icons (curses req offhand for necros)
"knife" skin blood idols (blood req offhand for necros)
spined focus (blood req offhand for necros)
skull brush (curses req offhand for necros)
Wooden Chakrams (mesmer offhand, illusion for sure, maybe domination, too)
Stone Chakrams (mesmer offhand, domination or illusion)
Writing Focus (rit offhand, not sure what req)
Eerie Focus (rit offhand, communing req)
Scepters of the Forgotten (ok, it seems like there's a lot of these, but I think that's because they come in many different requirements for all the caster classes. If you look for ones with just a certain requirement, they do seem rare ... and a lot of buyers are really into getting max damage from their wands right now.)
Same as Scepters of the forgotten goes for Silver and Wooden boar scepters.
So here are some results of mine from the following three recent or active sales threads and in game.
thread from a couple weeks ago (sale histories stored in my first bump post on page 2)
thread from lately
hi end thread from lately
Ok, I have trouble keeping track of where and how much I bought stuff for. Not that I'm trying to scam people, but I do tend to buy stuff for 10k or less when someone that doesn't know what it is offers. :S
Let's see, working from memory here ... in game:
r9 aureate lamp 60k sold (I think the posted target for these is way too low)
r9 holy vial 50k sold (I think the posted target for these is too low)
r12 (but otherwise perfect inherent) canthan, lantern fire staff 40k sold (buyer snapped it up right away)
r9 tactics sea purse shield 70k sold (bought for 5e and added my own +30 and 5/20 ... mods really do count when they're more than 10% of the item cost, but it's still probably not wise to spend much money modding weapons for resale.)
Via Guru threads:
r12 avian axe 5k sold
r9 vabbian scimitar 5k sold
r12 desolation sword 4k sold
r10 inscrib brute sword 20k sold
r13 desolation maul 3k sold
r10 ancient scythe 15k sold
r9 nightmare scythe 32k sold
r9mot vabbian defender 15k sold
r9mot tribal shield 25k sold
r10 clouded spear 10k sold
r9dom stone chakram 7k sold (think I bought it for 5k or less, but there was only one bidder)
r9 blessed chalice 25k sold 2x
r11 holy vial, 25k sold
r9 holy vial, 37k sold
r11 canthan fire staff, 35k sold
r9 holy rod, 10k sold
r9 dead scepter, 10k sold
r13 blessed chalice, 5k sold
r10 shadow axe, 5k and 10k sold
r10 canthan metal earth staff, 8k sold
r10 metal air staff, 50k sold
r9 orrish earth staff, 100k+2e sold
r9 stony earth staff, 50k sold
r9 voltaic wand, 15k sold
r9mot vabbian tower shield, 5k sold
I'm skipping the stuff I sold for 1k before I knew what it was.
Cheers,
Luny