Put in your SYE first, then measure it (yoke to yoke centerline length). There's too many variables (adjusted control arms, driveline length, wheelbase, etc.) at play to just 'buy' a universal CV shaft, which some people like TeraFlex and Rubicon Express will sell you.
Mine came out to 16.75" after I did my build up which has 4" lift springs - however put in your SYE first, then measure it. I ordered mine from tom woods and had it in 3 days from order to delivery - you could even overnight it. If you can't have that much down time - just stick in in 4wd and drive it around with the front axle powering it for the few days that you don't have a rear driveshaft.
You will want a single 'double cordon' (AKA 'CV') shaft, with 1310 u-joints (joints on both ends, no flanges or anything).
Go with 4" of lift - anything bigger just trim away or go flatfenders; you'll learn to love the stability if you actually wheel it
Plus you can still get away with a high clearance skid plate - at 6", even with a standard SYE, driveline angles are pretty bad without a t-case drop with the stock skid plate.