That's how I did the SR6012. The 5012 was my budget and one day I logged into Amazon and saw the price drops. I didn't know that it was part of the cycle. But I jumped on the 6012 which was now less than I budgeted for the 5012 at MSRP.
I was going to buy the 3600 last year when the 3700 released, but the system was already breaking down and there was a very small window I missed where the price drop and availability overlapped. Availability vanished, then the prices went up. *shrugs