I want to build couple of good systems for office use. Budget up to $600 each (better if less)
Requirements One of them needs to run Photo Shop well.
2 monitor support
I'm thinking to simplify it and use max amount towards best build, maybe:
reuse cases from current dells/hps,
micro atx mobo, with onboard dual video outputs
1 machine 16GB of ram for Photoshop,
the other 8 Gb,
on board raid for backup purposes
Intel i7 cpu for best multithreading
SSD III drive
Win7 64 bit enterprise?
Generic DVD recorder/player (BluRay reader useless, right?)
This thing gotta fly versus generic store bought premade garbage.
I wouldn't reuse cases - they've likely got bad cooling, and a lot of low-end desktops have proprietary mounting systems for their motherboards, because everything is made to the manufacturer's specs.
I think that everything looks good for you - the only thing I'd do is use a Trinity APU. It'll cut down on your costs and give you the perfect amount of power for what you want. Multithreading / multicores isn't much of an issue, Trinity should serve you fine... it'll be a LOT cheaper, and you also won't have to buy a graphics card for better photoshop / rendering / editing.
I agree about propriatery mounting for motherboards, that's why it's only "if" I can reuse it. I don't think I worry much about cooling aren't todays cpus way cooler than say P4? Plus zero gaming, it should be getting to sweaty in there, no?