I want to connect my PC via HDMI to my 50in 720p plasma (1024*768) and to my 22in comp screen (1680x1050)
I want to play Microsoft Flight Simulator X, maybe not at the highest settings but I want it hot, it would be the only game I'll play
My budget is 700-900 $CDN
I want to play mkvs and other HD content
I want to set it up this week or next one.
Here is where I'm heading, please suggest or comment, prices come from NCIX and Newegg Canada:
Just make sure the RAM you chose is on the motherboard's QVL, to make sure it's totally compatible. Other than that, I don't have complaints about your system, except that if you're building a system to "just" play FSX, you can get away with cheaper parts—that are on dead-end platforms (socket LGA 775, etc.)
There is an issue here you may not have considered.
You say you want to run FSX at 720p on your TV. However you also state your TV is not a 720p set, and that it runs at 1024x768. I assume the TV has an aspect ratio of 16:9, and this means that the pixel aspect ratio is not square. This means if you pump 720p from the 5770 to the TV it will have to be scaled by the TV, and you may be surprised by the loss in image quality. This will probably have a severe effect on your ability to read cockput gauges.
Also, usual windows tasks will be almost impossible at non square 1024x768. Yes it is possible, but if you are used to using windows at square 16XX x 10XX you are in for trouble. Objects like text will lose significant definition because some of their horizontal resolution is being discarded.
A partial solution to improve the quality would be to run a custom 16:9 768p resolution from the 5770. You will still lose some horizontal resolution to scaling, but it will not be as severe. Windows only supports square aspect ratios, so pixel loss is unavoidable with your TV.
Also, at a 720p or a custom 768p resolution your CPU will an extreme bottleneck for FSX, the GPU load will be small in comparison. As such I wouldn't go any higher than a 5770, instead putting money into the CPU.