On my old truck (F-150) I went up to a 4.56 from 3.55 when I put the 35's on. It was a night and day difference, truck was much more enjoyable and had all the power back. I used my truck for about everything, towing, DD, highway, ETC, and would not change my decision on gearing a bit.
Also since you are most likely going to be changing the carrier in the rear (to make room for the larger pinion) you might consider adding a locker or some type of limited slip. IIRC you can use the stock front carrier, but you will have to have to buy a special "notched" center pin if you go with the 4.56's or larger.
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