I'm running:

i7 920 (stock speed)
12gb (Mushkin) DDR3 1600mhz
Nvidia GTX 275 (1GB) - Running one 30.5" monitor, at 2560x1600.
Patriot Torqx 64mb SSD (220mb seq.read, 1ms seek)

It is smooth everywhere, with view distance at 50% and most of the other options down.
I haven't really turned the options up much; that's basically the settings I used when I was using the Q6600, except instead of being choppy in places, it is smooth everywhere.