I've been thinking of getting a larger cassette for my bike to tackle hills better, and I'm just looking for some thoughts.
I have a 2011 Honky Tonk (http://www.evanscycles.com/products/kona/honky-tonk-2011-road-bike-ec026518), with an IRD 12-28 on the back (the IRD is kind of meh, shifts rough).The setup is pretty middle of the road components wise (Sora on the front, Tiagra on the back, 9 speed).
Harris Cyclery offers a 13-30t cassette. Which would fit my current derailleur. But if I wanted to get something like a 13-34t cassette which long cage derailleur would people suggest swapping to?