I'm going to build my first computer and I could use all the help I can get. I was hoping you guys could take a look at the build that I've come up with and give me some suggestions. I'm especially looking for help on what power supply I'll need for this and i plan on only spending about 700$.
AnTec900 Case http://ncix.com/products/?sku=21123&vpn=NINE%20HUNDRED&...
That's a mini-ATX board which I'd normally hesitate to recommend but it's close in price to your original set. I'd much rather see you in the P8P67 pro which is a standard ATX board ($185- ish) but so many of these boards were sold before the defect was corrected that the entire production run in still going to replace the original defective boards. If ya have few more bucks, the Asus Sabertooth is a very impressive board. It's $220 price tag reflects its industrial strength "TUF" design which includes substantial "Militarized" component upgrades and 5 year warranty.
Definitely stray way from that 460 se, it is a crippled version with stripped shader count. When selecting a psu look for a reputable brand with at least an 80+ efficiency rating good brands being Antec, Corsair, Seasonic..... If you are looking for a single card setup a good 500w-550(depending on the gpu) would suffice, but if you plan on going cf/sli you should look for more power.
With the set up that you have going here a power supply in the 500 to 550 watt range will do well for you as don't do any major overclocking or SLI or Crossfire configurations. Focus on getting the Intel® Core™ I5 2500K and a nice P67 series board. I also would plan to add an SSD drive as a boot drive in the future, it can really improve boot times and access times. Take a look at the Intel Solid State Drives 320's 80GB should work very well for you as a boot drive.