A year ago, my choice was a Gateway with a lot of ram memory. I have been very satisfied with the machine. Since Micron (MHC as I recall) purchased Gateway and I have owned a number of Micron machines, their overall quality seems to be UP. I don't buy Dell machines. Won't. I don't buy HP desktops although their overall rating has gone up considerably in the last couple of years. HP desktops used to last about 2-years max; quality has improved as I understand it. I choose HP for laptops as they have the highest product rating the last time I checked. The newer laptops are much updated from ones produced only a couple years ago.
I rather like my new HP laptop, a dv7-1240us - about $750 after rebate (which we're still waiting on, of course, so ATM we're out $900 for the computer), so it's not a bargain-basement machine but it's not their top-end job either. It DOES have plenty of crapware on it, which we're slowly dealing with, but it plays nice with the new wireless network, talks to the printer and the USB backup drive attached to the desktop machine over said network, and even plays my games well (none of which are anywhere NEAR bleeding-edge - we're talking about Tron 2.0 and Star Wars Battlefront 2 here).
64-bit WinVista Home Premium, AMD Turion RM-72 dual-core (2.1 GHz, runs plenty fast for our purposes), built-in wireless has been troublefree, integrated graphics chip is surprisingly good (again, I'm not demanding too much from it), 4GB RAM and a 320GB SATA drive, Lightscribe DVD burner (which I haven't played with yet, but it reads and burns regular discs like any other DVD burner). My only complaints, and they're tiny ones, are that the finish on the machine, including the touchpad (which has an integrated physical button to turn it off if you'd rather plug in a mouse! EVERYONE should be doing that!), is a shiny dark-brass which attracts fingerprints, and the keyboard markings are decidedly low-visibility and not backlit. Helps my touch-typing skills, I guess.