Newegg.com - MSI Z77A-G43 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS 100$ after rebate
Newegg.com - Intel Core i5-3570 Ivy Bridge 3.4GHz (3.8GHz Turbo Boost) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 2500 BX80637i53570 200$ after promo code: EMCJHJJ58
I don't know what your doing but this seem spretty good
P.S if you live near a microcenter you can buy an i5 3570k for 170$ Intel Core i5 3570K 3.4GHz LGA 1155 Processor 407627 - Micro Center
Well like I said, GPU upgrade depends on what PSU you currently have and its wattage. If your PSU is decent for the money you could get a GTX 660 instead.