Just to get somthing clear..

Ok so my guild went luxon (the pirate lookin guys) the problem is i like the kurzick warrior armor (the batman lookin one). Can i get an armor from the opposite side without leaving my guild?

Guild/alliance alignment only affects who you can donate Faction to, as well as who appears in your guild hall for Alliance battles. You can be aligned to either side. If you're aligned to the faction opposite your guild's, you'll get this message from your guild's faction's NPCs:

This is good news. I didn't want every character on an account to have to align the same way (with the guild).

But every character on your account will be aligned the same way based on your account's amount of faction...

(ie, if your warrior has 5,000 Kurzick Faction, all your characters do)

Oh crap. Oh well. At least I can choose differently than the guild, though.