ditch the motherboard. ECS is said to have crap quality. go with asus or gigabyte mb's.
also, no cheap power supplies. antec, corsair, seasonic, thermaltake are the ones to get.
if you get a cheap build right now, it's not going to last long. most of the cheap stuff are crappy products. it's better to save up for a better build than build a crappy rig now.
A PC build for such a ridiculously low budget just isn't doable. If you want a PC that cheap, you'll have to buy a second hand throwout from craigslist or ebay.
The parts I've listed will give you a quality new PC< but you will need to use your old hard drive, DVD rom drive and monitor, plus of course mouse, keyboard etc.