Building a new system, need part recommendations.

Things I need:
Case (I have an old Dell Case, but it looks like a hassle to work in.)

Power supply (I have an the Dell powers supply that came in my old case, but not sure it would be strong enough for a new system).

Ram

Video Card

Motherboard

Other stuff I've forgotten (I'm pretty new to this).

Things I have that system needs to be compatible with:

SATA Hard Drive
Asus VS248 (Decent monitor, but has ghosting issues which may be due to graphics card compatibility. Hopefully somebody who has the same monitor can recommend a graphics card that works in their system)

Fortunately, I don't need an operating system, keyboard, mouse, speakers etc.

Looking to build a new-game capable system for 500-750 bucks. The biggest issue I'm concerned about is getting parts that aren't compatible or don't work well together, so ideally recommenders have a similar complete system rather than just good experiences with an individual part.

Timeframe is ASAP. Current system needs to run checkdisk on startup...