Well lately prices are on a landslide
There are X58 boards pushing below the $200 envelope and 6GB of DDR3 1333 (PC10666) runs at about $70~$85 now
In reality you'd only really want to go i7 for the synthetic benchmarks and 3dMark scores, or if your planning on Quad SLI, Quad xFire, or 3-Way SLI with top end GFX cards
In gaming the fractional FPS increase (2~3 FPS) the i7 offers over the phenom in a typical scenario isn't practical for the price difference.
Myself I'm upgrading soon and going i7 but I plan on overclocking it's nuts off for benchmarks