I went from a triple (52/39/30 I think) x 12-26 to a compact double (50/34) x 13-29 and have found little difference between the 30x26 and 34x29. I've noticed it only on the worst of the worst hills. For the ease of transition, I would definitely say go with the compact double and get the biggest rear cassette you can. (which is 27 or 28 for shimano, I think)