as for a gaming computer you are really going down on the GPU. The GT630 is not really considered a gaming card. Sure it can game, But if you are planing on gaming anything more than the sims, you might reconsider your choice of GPU.
Why that PSU? It's VERY low end. Also from a non respected brand. It doesn't even look to be 80+ certified. Do you know what that means? it means that it's not at all power efficient. I am a big fan of efficiency. That's why i have a a 80+ platinum. At least get a 80+ bronze. i recommend the this one if you are on a budget and uses low-mid end hardware: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply (CX430) - PCPartPicker
it's only 8 bucks more on sale right now. if you can buy it yet and the sale ends, you can still buy it for 30 bucks. That's only 18 more than your current PSU choice. and it's MUCH better.
Why 16 gig RAM? And why not a dual kit? it's cheaper to buy 2 in a packed, than 2 separate.
I use 8. that's plenty for any gaming machine.
Check these out: Mushkin Blackline 8GB (2 x 4GB) DDR3-1600 Memory (996995) - PCPartPicker
It's cheaper than your current choice of RAM.