Gaming PC Tips. Is this a good build?

Do you guys think this is a good build?

NZXT SOURCE 210 RED CASE USB 3.0 GAMING CHASSIS:bounce:
ASRock H81M-HDS Motherboard and Intel Core i3-4130 3.4GHz Combo Fan Cooling
G.SKILL Ripjaws X Series 8GB DDR3 1333 (PC3 10600) Desktop Memory
GENERIC 500GB 7200 RPM Internal Hard Drive
AMD R7-250 1GB/400Watt Radeon R7 250 1GB Video Card with 400W Power Supply Included
Generic CD/DVD Burner
Microsoft Windows 8.1 - 64-bit - OEM

I built it on Newegg.com
Any tips on how I can improve it? I'm willing to pay $500-$750