I paid 450 for a 160GB X25-M G2. I still think it was a good deal compared to Raptor pricing years ago. Maybe it's poor logic, but for me, the improvement being quite a bit over any Raptor for an OS drive, while remaining in the under $500 ballpark sold me. I have a 40GB X25-V on the way too, because it was so cheap (110) and will make a great laptop drive for years to come.
I see no reason to wait, other than price, and people are expecting pricing to come down to HDD levels and that will be an extremely long wait. Other than higher throughput, which I welcome (I'll be buying the Intel SATA6gb drives), the major performance improvement is already here