I'll actually vouch for the Halo TSA, was my first hopper. abit of info for those the don't know: Its a Low profile halo shape much like the magna, It's drive system is much like a revvy but with left/right rotation so it feeds in any direction without any jams, its tough and durable and feeds 13+ a second.
It's an excellent hopperfor the price and definatly usful as a back up (i still have mine!!)