I really would not like to hazard a proper guess on yours, but I sold a q8 15^50 for 30e recently, and even though the inherent on yours is not the most desired, otherwise that is one sweet sword and I imagine it will fetch a pretty penny more than my q8 sold for
Others I am sure will come up with an more exact estimate, and I am keen to see what they say.
100e+ imo. R7's get a lot of love. FDS's get more than a lot of love. It's a max inherent. Not 400... :S but I could see 115-125e on a really sunny day perhaps.
Betwen 120e- 200e , depends on buyer comeone is q7 maxim dmg and that mode 15/ench is not so bad. this is my opinion , i saw q7 swords with worse mods and to high prices .