Ok, my brother and sister have been really bugging me to go to Vista since they like it (according to them). Anyways getting to the point, They like it, and I like performance so I got Vista Ultimate x86 and used vLite to rip stuff from it to make it work better such as the languages(Japanese and Chinese), the Help function and others like the function that allows you to 'speak' to your computer (in other words typing for lazy people) and that saved more than 1gb off the installer.

I'm running on a Intel C2D 1.6Ghz processor, 1gb of RAM, a 512mb Video card(ASUS something), and Windows XP SP2, my PC has done well so far.
BUT I want to know if it will perform well under Vista Ultimate since alot of people say its a RAM whore and stuff.

Upgrade and satisfy my siblings (and maybe myself with DX10), or stay in XP and keep things the way they are?

I WANT OPINIONS! please post people. . . . and VOTE!