http://pcpartpicker.com/parts/partlist/
Id suggest the latest i3 or the new pentium thats unlocked on a LGA1150 motherboard. If later you want to upgrade you can throw in a i7 cpu.
Try it without a graphics card first. Haswell does work pretty well if your on a budget. The pentium needs to be overclocked to take advantage of it, otherwise stick with the i3.
If you want it to boot up fast and feel fast and responsive try a SSD with a secondary hard drive.
go with 8GB ram if you want it it to last for awhile or do a 4 with another 4 later for an upgrade.
If you want some decent sound for a budget price try using an asus xonar sound card.
Dont skimp on the power supply... get a certified 80; plenty of sells on those.