Whatever you do, if you get 60s, get full float. Many stories on here about semi float 60s (not worth the savings). Dynatrac will be the most money, but considered by many (including me) to be the best. They will have the thickest tubes, largest outer Cs, toughest balljoints (Prosteer that is), and the best hubs too. Another route would be the Dana Ultimate 60s (that's what I went with-I couldn't justify the extra cost for the amount of wheeling I do). These are quite a bit cheaper. Still a quality axle. There are a few companies that offer these with Air lockers, but for the most part you will only find the axles sold two different ways. One with 5.38 gears and the other with 4.88. You don't get a choice on axles, lockers, hubs, etc; all beefy parts though that will support 40s for mild wheeling. There are other options too. Currie and Teraflex are two others. If you plan to never go 40s and stay with 37s you will more than likely be fine with a Dynatrac PR44 and just upgrading your rear stocker. I ran that way for close to two years with never a problem (again though, only wheeling 7-8 times a year and no high speed).