Oh definitely, you can slow it down with final cut pro by itself at 1/2 speed with 60fps no problem. But if you're looking to go slower than 1/4 speed you'd need either a program like Twixtor or 240fps. I'll have to get some shots and post them for reference.
Yeah fair enough, 60 fps will do 1/2 speed with no need for interpolation... Technically 120 fps should be able to do 1/4 speed with no interpolation too. 240 fps would be good for 1/8th speed and so on.
This is one of the things that bugs me about DSLRs. I really want to upgrade my DSLR to a full frame Canon 5D mark II, but it only shoots in 30 fps modes. I was thinking about renting a proper slow mo camera for a day at the hill, the rest of the stuff I want to catch will be fine at 60 fps.