I recently came to the conclusion that a new desktop would be better than a new laptop, so I've been looking around at some desktops for under $800. I want to use it for some light gaming, light video editing, and using the internet and watching videos occasionally. Resolution isn't too important to me, but I'd like at least 720p, and 1080p would be nice. The only games I have right now are Amnesia (which I hear can run on lower systems) and Portal (from when it was free), though I do want to get the Valve Complete Pack at some point. Trying to buy new so I won't be reusing my old desktop's parts, and I'm not interested in overclocking anything. Most importantly I'd like to be able to play games at a good FPS, like 30, and with some decent effects on, like lighting and shadows. I want to play F.E.A.R. with its intended atmosphere without it being a slideshow. But I don't need to play the latest Crysis on super high or anything.
While researching, I heard that it's a good idea to get a desktop with a better processor than graphics card, and just switch in a nicer graphics card. Someone suggested the following desktop that comes with a monitor and speakers, and a graphics card to replace the existing one. I found another version of the same card, and I can't tell which one would be better to switch in.
DELL Inspiron i570-6111BK 23" Desktop PC
Athlon II X4 645(3.1GHz)
6GB DDR3
500GB HDD Capacity
ATI Radeon HD 4200
Windows 7 Home Premium 64-Bit
(Comes w/ 23” monitor & speakers)
$629.99
EVGA 01G-P3-1556-KR GeForce GTX 550 Ti (Fermi) FPB 1GB
192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
$134.99
-OR-
ASUS ENGTX550 TI DC TOP/DI/1GD5 GeForce GTX 550 Ti (Fermi) 1GB
192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
$139.99
Total cost $765-$770.
Does that sound like a good deal? Would I be getting the most power for my money, or would it be better to go with one of the setups from the charts in the OP? I'm not great with computer hardware beyond plugging stuff in, so I don't know if I could piece everything together myself from scratch. Any suggestions, Tech-GAF?