Can't really go wrong with any kifaru pack. I have an ultralight 5200, Longhunter , and a lateseason. All three are awesome in their own way! Bikini frame is legit as is the duplex!!
I had a T2 and switched to a duplex. I love the duplex and am much more happy with it over the T2 because of its vesitility. You may think about a regualr duplex just becasue while stand hunting in ohio you can use it to haul around your treestand and other things. The Bikini will accomplish this as well but I like having the framesheet.