Most people, myself included, would recommend getting the i7 920 and overclock it, get a single slot dual gpu card and save your money for graphics upgrades in the future. A single GTX 295 will be great for now.
If you want to put you money somewhere more permanent: get a really nice monitor and sound setup.
Trust me a 4k rig is a waste of money. You are literally throwing away your cash for a rig that will be outperformed by newer and better hardware. I would spend around $1500 then you can build another $1500 rig 2 or 3 years from now and put the extra $1000 in upgrades over time.