I agree. I have no regrets with the purchase, great lens. I tend to do a lot of research on things before I pull the trigger. Almost everyone was convinced the only difference between the 2 was the IS, therefore you were paying $400 just for the IS. The IQ of my lens is stunning, and that is with shooting old crop sensor technology. I just went from 2 7Ds to 2 6Ds, meaning I can't wait to see my results on a FF sensor.
The only reason I've been paying attention to this price reduction lately is because my 100mm needs to go to Canon for repair. If they come back with a quote higher than maybe, let's say $400, I would probably not do it and just get a new lens.
I do know what you mean about getting what you can, when you can. I came up with a strategy. I start by purchasing a $25 or $50 B&H gift card every payday. Once I get some decent $$, I decide what my next purchase will be. Not only do prices & sales change all the time, B&H specials & bundles also change all the time. When I find what I need at the price I want, I buy it. Then, of course, I start buying gift cards all over again.