Please... no fountain pumps. Believe me... the one thing I learned from my watercooling experience is that head capacity is more important than flowrate due to the fact that most mag drive pumps are poor at producing any great amount of pressure. I'm concerned that if you buy a pump with a huge flowrate you'll end up running on the tail end of the pump's H-Q curve (sort of like I am...
). With that said though, it's very hard to estimate what size pump is needed before you build... and it's even harder to find one that has a good pump curve that balances head with flow in the range that you'll be operating in.
Ok... was that confusing? Simply said, I am suggesting that you look for a pump with at least 20' of lift if you're going to have any sort of long runs... though the more you have the better (without getting carried away of course). Oh, and I totally agree with your tubing selection for the mains... 1" would help reduce any wall friction in the tubes greatly.