If you plan on doing video stay away from the mkTR, they're ok for still work but terrible for video unless you want to reengineer the roll axis mechanics, they're also Heavy. The Hisight mounts work well for light cameras as long as you don't expect pro quality results from it. I have a Hisight II under my MK hexa and it never carries anything heavier than a GoPro and it works pretty good that way. While my NEX 5N fits the servos and linkages just can't deal with the extra weight, the video becomes wobbly and the movement shows definite stair stepping as the servos struggle to move the Nex.
I've used a lot of the less expensive mounts and all I can say is buy a really cheap one and learn from it. If you're going to spend any appreciable amount of $, don't throw it away on an inferior mount that you won't be satisifed with, wait and buy a good quality and well proven mount that actually works and you'll be much further ahead. As for the AV130 that got bent up when my CS6 went down, it cost me a couple hours of time and about $60 in parts to put it back to good as new condition, all that really needed to be replaced were the roll arches and the rack gear that bolts into it, the rest of it was able to be straightened and/or repaired. That wasn't the first time that happened to that 130, it had been squashed once before under a different frame although not quite as bad, the second time was a bit too much for some of the aluminum parts to be straightened again so I replaced them, I was more PO'd over the damage to the NEX 5N than what happened to the 130.
The DJI gimbal may well be a game changer if it proves to be all they claim, only one problem, it will only work with the WKM controller. I'll have one on the CineStar 6 as soon as I can get my hands on one.
And if you really want to know from someone who's been there, get the AV130, there isn't much else available that can beat it and it really isn't as heavy as you think, it's much lighter than an mkTR and it's twice the performance.
Ken