My father needs a new pc and would like me to build one for him. After building my own gaming pc (5770, i7 750, 4g ram, sc2 oriented pc) I feel confident enough to build him one.
With two Samsung 997DF 19" CRT monitors ready the system will need a gpu capable of running windows 7 smoothly on both monitors with default resolution. No lag, slowness of any sorts while surfing net, writing emails or typing word documents is the ideal. There will be no gaming.
For only $5 I would go with the CAS 8 latency. Will you see a difference? probably not but then again it is only $5 more for slightly faster RAM.
For the Graphics card, I would choose the 5670. It has way more power than the 8400 plus its a newer model. The type of monitor doesn't matter. Most likely he will be running 1280x1024 and the 5670 will be great.
Also, if you are not budget constrained, I would consider the Athlon X4 640. For $20 you get a quad core.