I do not have a worldly experience with different cutters, but after over a year of hemming and hawing I went with one of the dual rail Rotatrims. Many of the reviews I looked at read like Alex's post above, after disappointment with other brands people end up happy with a Rotatrim. It's somewhat annoying to have suggestions that are above your budget but some things are just worth saving for if possible.
I've had mine for 2 years now, I was pretty impressed with how square it cut and just how thin a strip it can accurately cut off. Trouble free so far and I expect it will outlast me.