Compaq presario PC
AMD Athlon™ 64 processor 3800+ 2.4 GHz
1 gb memory
NVIDiA GeForce 6150SE nForce 430
55GB free hd space
is currently what i got, computers about 7 years old (i think) i don't think i'd want to salvage anything. bump it up to possibly 500 for creations sake. not really worried about having much on it besides d3. Albany/long island for purchasing area. 1280 X 1024 is the resolution i'm currently running at, but basically could change to whatever would let me run it best
I think the $700 Alienware X51 is about the cheapest you could go to get an ejoyable Diablo 3 experience. With very careful part selection you could possibly do it for $500 if you build the system yourself.
Generally speaking, it's very difficult to find a pre-built system in this price range with enough GPU power for 3D games like Diablo 3.
Your 1280x1024 monitor will work with the game, but ideally you'd upgrade to a 16:9 monitor (1920x1080 resolution, for example). If you play at 1280x1024, your view of the game world will have the sides cut off, putting you at a tactical disadvantage; you could use the game's "letterbox" option to crop your view to 1280x720, giving you the full viewing distance, but making everything very small.