do a google search talknotebook or notebookforum.com i forgot which one. Anyways way more reviews and pictures and opinions of different laptops. I also work at best buy and doesn't matter which laptop you get make sure you have some protection plan from any company IMO.
As for the DIMMS. Well to get a gig its either 2x512 megs sticks(2Dimms) or 1x1024MB stick (1 dimm also more expensive) i believe almost 90 percent of laptops have 2 dimms only. Just make sure you can find a laptop w/ atleast a 5400 RPM hard drive and 1.6 centrino min. and 512 really with 1 Dimm.
couple of models to take into consideration
HP
zt3000
dv1040
Sony
S-Series
Toshiba
M35X- Series
Acer