Anything 500W or above will do fine. Don't get something cheap though, but since you are wanting to make your PC flashy, you don't have to worry about that.
Well you dont need a different one if your talking about cold cathodes, they only require about 3 watts a piece you could run 20 and probably be safe with your current psu.
geez guys the only reason u would need a 500w psu is if ur powering a microwave... i got a 350w and i have 2 hdd's 3 fans 2 ccfls a lcd display and 2 cd drives and i only use 280watts