I have the Aviator 2 & have it working fine for me (after a lot of soldering, drilling &, research). There is an ace edge on ebay right now for $89.99, probaby the cheapest you're gonna find one.
http://cgi.ebay.com/XBOX-360-ACE-COM...d=p3286.c0.m14
If you want to mod your AV8TR so the buttons are within reach I have posted a link to an MS word file that takes you step by step here.
http://cid-e9f7efbb1bd5f5d6.skydrive...VA8R%20MOD.doc