i'd go built in wifi...
Here's what I'll be doing:
Min out on ram from dell, and buy the ram for much cheaper somewhere else... that'll save like $400.
My current laptop is 11 pounds, and I take it to school everyday, and to work, etc... I'd be happy to a lighter laptop... i wish they had the inspiron 4200 out...
Oh, and i am running a server off this sorta

... Maybe I'll just go with 1GB of ram, but with the hd speeds of laptops, it be great to be able to turn off the swap.... speaking of hd speeds... I hope dell puts in the 40GB 5400rpm drive instead of the 4500rpm drive that they have in there right now.... Maybe I'll just min-out on the HD and buy a drive from IBM... probably about the same price.
I'll remind you that i'm buying this in may, so the prices will have dropped by then... and my parents are paying for half, cause i'm giving my dad my current laptop (he has a 150mhz one right now).