C4 always go for the D60 sale. He's correct on all the statements he makes and it is the ideal choice IF you're willing to spend all the money it takes to go D60.
To answer your question, regear your half ton axles, or look for 3/4 ton axles with lower gears already, I'd go with the 3/4 ton axles with the lower gear in them already. 4.10 is the most common gear ratio in the 3/4 tons. I'd say you have a good chance of finding a 4.10 ratio set with 14b full float rear end, and Dana44 or GM Corp 10 bolt to match it and already set up for 8 lug wheels for about $300. Keep in mnd, they'll be used, might need seals, bearings and brakes.
But, your 1/2 ton 3.73 axles should be an easy sale too since 3.08 is a common gear ratio for 1/2 ton 4x4's. Someone will buy your axles just to get a lower 1/2 ton ratio.