I already have a laptop but it has integrated graphics. Basically I'd buy this to play Civ 5 and Diablo 3 and such over the summer, so I don't want to spend too much. I might also use it for programming, AutoCAD, GIS and the like.
CPU:Intel Pentium G620 Sandy Bridge 2.6GHz
GPU:ECS Geforce GT 440 1GB GDDR5
Mobo: Gigabyte GA-H61MA-D3V
RAM: G.SKILL NS 2x2GB DDR3-1333
PSU: SeaSonic M12II 520W
Drive: I have a 1TB HD but it's an Ecogreen or somesuch (5400RPM). Not ideal for a system drive. I might throw in a SSD if I find a good deal.
With the used Viewsonic P815-4 (21" 1600x1200 CRT monitor) I found for 15$ I could get a decent rig for ~$500CAD. Do games still have decent support for 4:3? This Asus IPS on sale is also tempting.
Shopping for computers make me feel old. I'm baffled by how much power I can get for that much money.

