^-- from that list this is the best one when it comes to performance:
Compaq Presario 15.4" Laptop featuring Pentium Dual-Core T2390 (C771US) - Refurbished - Online Only
http://www.bestbuy.ca/catalog/proddetail.asp?sku_id=0926INGFS10116284&catid=25253&PCName=laptop_499_under&logon=&langid=EN&MSCSProfile=3C79F0C7EA3162B2B9AD68C2316B6FA1ACD94A486BA0DB604E0C912F8F6C9EC7D4703F766C6ED4464BC23322C6B79932DC9D139B6EEF2CF9FADACCFE7F7B0FA9FEC757243C00DE045FA95E41BB4929D19771C0D6B0EF11785E49BC12FD249DFD3BD200D62CA4FDF2D0EC188A4CC76E32301E8A354ED86662
All the others are either the (tiny ones) with an Atom processor and small 8,9" or 10" screens, or with Celeron processor.
But this one is a refurbished one. Thats why its so cheap, if you have no problem with that?!