I really hate the Shimano "mega-range" set - it jumps from something like 28 all the way to 34 in one jump. When I had one, if I didn't realize that I was down in 2, when I downshifted the drop in gear ratio just about put me off the bike.

When I replaced the cassette, I made sure that the lowest gear was only down to 28. With a triple, 28 is plenty low even climbing hills, unless you've got crazy hills.