I just had to make the same decision as you and I went with the 460 1gb SC from EVGA. At $180-$200 (after mail in rebates) they seem to be in a price/performance sweet spot. The 470 didn't seem fast enough to justify the extra price and the radeon cards are going for way over MSRP right now (at least they made nvidia lower their prices!).
Unless you are considering the 480 SLI ($1000?), the 460 seems like an awesome deal because you can SLI the 460 1gb down the road and get 10% - 25% better performance than a single 480 and still be under $400 total.