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that's a lot of ram, i doubt you'll ever make use of it but ok...
if you really want 4gb of ram you'll have to get either xp 64 bit (not the common 32 bit version) or vista, and i doubt they sell xp 64 bit on retail.

you should try it at real store, check the battery life, the weight , the keyboard, the monitor (if it's glossy or mate, some people really hate glossy monitors)...