Well, I hadn't thought about it, thanks for pointing that out. If the price differential isn't too great ideally would like the timer to be able to control the pump speed as well as the off/on cycles. If it isn't too much to ask, do you have a suggestion for each type?
Well it's hard to beat the Intermatic T104 for single speed operation.
For 2-speed operation I'd suggest the T10404R. It contains two timers and you can set then to operate high and low speeds. Note that the T10604R, or higher end PE153, is more appropriate for dual speed pumps. JasonLion
They also make equivilent electronic timers if you'd rather have those. Just look for something with dual timer functions.