i have never managed to move to vista from xp.. i dont think i will be able to move to win7.. i just like simplicity in winxp.. and it's much more user friendly for me than vista..
Win7 is winner mate. I was exactly like you. If you have a dual core or up and intend on having 4gb+ of RAM then seriosuly upgrade to Win7 64b. You won't be dissapointed.
If you are on a p4 2GB RAM just get the 32bit

Either way, give it a whirl, once you go 7 you won't go back!