Here an Intel CPU/AMD GPU based build suggestion .
CPU & GPU : $273 - Intel i3-4150 & Sapphire R9 270 -
http://www.newegg.com/Product/ComboDealDetails.aspx?Ite... (GPU Much better than current choice)
Motherboard: $58- Biostar H81-
http://www.newegg.com/Product/Product.aspx?Item=N82E168... (It has free Wifi card)
HDD & Case Fan: $56- Seagate 1TB -
http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...
RAM & ODD $53- : GSKill 4GB & LiteOn -
http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...(To keep cost into consideration used one 4 GB stick , get another 4GB stick later. Also $5 off with promo on ODD)
PSU- EVGA 430 80+ Certified ($40) -
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Case: $35 - NZXT Source 210 -
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Monitor: $110- Acer 21.5" FullHD LED -
http://www.newegg.com/Product/Product.aspx?Item=N82E168... (Has $10 off with promo)
Total (Excl. Rebates,promo): 624 USD
Rebates,Promo: $55
Hope you like it!