My son purchased a Matthews Mission Craze 5 or 6 years ago at the age of 16. He wants to go with a little bigger bow. I mentioned an Elite Enlist or a Matthews Switchback. He is 6 ft 155 lbs. Draw length 29″ And wants 60 lbs draw, possibly 70 lb. Any recommendations?

It sounds like any "adult" hunting bow will fit him, so it all comes down to budget and personal preference.  Those Switchbacks are hard to come by and seem to command a good price still as people loved that bow.  If you can find one in good shape it's certainly not a bad idea!  Just make sure you look over the string and cables to make sure they're not worn out and need to be replaced.