I think it looks good as is. I've never worked with a gigabyte case, but if you get a good deal on it, and there's nothing better that fits your budget, it should serve it's main purpose.
The OCZ power supply should be perfectly fine. Corsair is better, but if it's costing you that much more you can live without one. The only concern here is that you will have to replace it to add a second GPU.
4GB is plenty for now. Don't even consider any more if your OS isn't 64 bit.
Well i am thinking you not looking for extreme clocks and why not consider the 95W TDP quad 945 ^^ With some combos, a 23" Full HD LCD with a nice beefy 650watter it is primed for the next gen HD 5870/5850 cards should you games require more teeth down the road hehe While being under budget ^^
I am still somewhat in doubt about the power supply - I reckon (used wattage calculator) that the OCZ StealthXStream 500W will manage this build, but I am not sure that the Corsair 650W would be enough for 2 HD4890 in Crossfire. Therefore I will most likely go with the 500W, and in a year or two, will get a power supply that will provide enough juice.
As for the DDR3 timings, I am not all into those numbers, which is better: 8-8-8-24 or 9-9-9-25? Is it "the less the better"?
I will further check the monitors - though 24" 1920x1200 looks to be somewhat better than the 23" 1920x1080- I have a feeling the latter is "short" when comparing x and y axis of the screen.
Most likely I start ordering next week, so we will see what the result (and the benchmarks) will be...
I will have it also under consideration as smaller resolution would mean higher framerate with the same machine. But I am trying to make a PC that will last for quite some time (last time I bought a PC, it was 2002.), so I'd like to stick with the build I currently have, though regarding the monitor...
I have checked the screen sizes in some of the computer shops here and would like to ask, do 22" / 24" or bigger monitors appear too big when sitting 2 feet from them? Surely as the PC will be used for movies, I'd like a big screen and this monitor supports pixel mapping so it won't be a problem to reduce screen size...