Questions about The types of core duos and such.

Some questions I would like helped answered

Im looking to buy a notebook with at least 2 gigs of ram and a nice graphcis card.

Im a gamer but will use it mostly for school

1) Is there really a significant difference between the Core 2 Duos of t5500 and t5600 (dif of like .2 hertz). And is the t5600 compared to t7200 (2mb vs 4mb) a significance difference)? basically, will i notice a difference between the three.

2) Im looking ot buy it from Gentechpc.com cause it got good reviews and is really cheap. Is there any other customizable websites that offer even cheaper? Ive looked everyone. I guess ibuypower and cyberpowerpc is cheaper, but ive read a lot of bad reviews on them.

3) Im looking at the asus s96 series, is there a difference between the Z series?

4) Is there any other nice customizable brands like asus (similar to s96)? or is asus like hands down good? ( in terms of price) cause for a very similar price i can get like a sony or dell computer with the same stuff.

5) would it be cheaper to just buy one gig of ram, and buy another gig of ram (of the same type of course) separately and install it on my own? is it easy to do?

im trying to spend less than 1400.

tons of questions (but 1400 is a lot of money, you would agree i hope)

thanks

oo thanks thanks.

im not a hardcore gamer dont worry. i just want to be able to play games that came out like a year ago. and most importantly run a lot of apps like itunes/aim/folders/pics etc all at the same time without it slowing down.

does anyone know the answer to questions 1.

thank for the help