I did marlins 5 inch lift and loved it! easy(time consuming) to install runs great on road considering its a 26 year old truck with 37 inch tires. Id run 5.29s and really consider the 4.7 case it was one of the best improvements ive done.
One thing to think about is dual cases. I know its a pricey mod but chances are you with have to do driveshafts with this build so might as well only do them once. I spent alot of extra money trying to slowly build my truck instead of just biting the bullet and doing it all at once. hope that helps! if you have questions or want picts of anything let me know!