Based on what Q has been saying, I'm leaning in this
I'm still reeling over the jump from 2 cores to 6, DDR2 to DDR3, and working with a 64-bit OS. When the honeymoon starts to wear off and I feel need to spice things up a bit, I'll probably start looking to buy (but will continue to resist the urge to do so now).
EDIT: According to this
the 320s are still a bit more pricey than MSRP, so that might be incentive for waiting as well.