if your not going to overclock your i5 the one i picked out or the i5 3330 that does not have gpu built in is one of the best price..if you had a micro center you could get the 3570k for 190.00. the unlocked cpu and a good cooler will let you run them at 4.2g with a small over clock. you want to make sure you have a good power supply and buy a slightly larger one then needed. with mb it up to the ports and extra features they have..if you go with low end mb you need a wifi card if you want to hook it up wireless.
Hope this helps,
I assume your monitor is 1920X1080 resolution and I'll assume you want to play modern games. I have four computers at home I built for my family and all will game:
1. Phenom II X4 955, Radeon 6850 video - about $500 not including case
2. Core I3 3220, Radeon 6850 - HTPC cost about $750 with HTPC case and blu-ray drive
3. Core I5 2450P, Radeon 7850 2G - cost about $1000 with case and monitor
4. Core I7 3770K, Geforce GTX 670 OC - about $1200 without monitor.
It's hard to know what you want to play, but I would recommend:
MB: Asus P8Z77 -V LX $140 (I see no reason not to go Z77 chipset at your budget)
CPU: Intel Core i5 3550P $190 (the 'P' means no onboard video, but you want a video card anyway. This is the Ivybridge version of the 2450P)
Ram: 8 Gigs of name brand ram $40 (I have always liked Corsair and had great luck with G-Skill)
Power: Corsair TX V2 650 $100 (DON'T cheap out on PSU, could cost you in the long run. Lots of power for any one vid card, for crossfire maybe 850 watt)
Video: AMD 7850 2Gig or Nvidia GTX 660 $200 (build #3 above plays everything almost maxed and should be fine)
DVD drive $20 (Bluray for about $60)
SSD: 240 - 256 Gig $175 (Check the reviews and specials, I got a OCZ Agility 3 256 Gig for $120 on sale 9 months ago and it is great)
HDD: Seagate Barracuda 2TB $130 (You can go 1 or 3 TB for $90 or $150 depending on space requirements)
Case: $100 ( on Newegg)
Total $1095 (plus taxes, shipping, etc.)
With this build you can add a second vid card later. 650 watts will be fine for two 7850s, I crossfired two 6850s and my Phenom II on one for years. You can always drop to 128 Gig ssd to save money and put it towards more video power if you want. The processor in this build is locked, so your OC options are limited. You can always go up to an i5-3570K unlocked processor for $30 more and if you can afford it, I would, but it is unnecessary for games.