I assume all of these items are used? If so, then I'll just add up/approximate all the parts and subtract 20%. That's an off-brand PSU I assume.
It's a decent deal--thanks to the monitor. At least I'm pretty sure that thing's worth more than $120. If the monitor is worth $120, then it's worth $600 total. The Q9300 should OC nicely too. The only thing that'll be wrong with it is your graphics will be anemic compared the rest of the build.
Wow! It comes with Windows 7 too!? I'm assuming it's the ebay item I found. So long as it's a legal copy--that's a very good price. It's a couple generations old, technology wise, but it will still get it done for a while.
If you're not a DIY person, this should be great for you. I dunno about customer support though.