Reedy, thunder power, speed zone are my three choices. I've been running the 6500/65c reedys for the past month or so and they've been run at least 2 cycles per pack each day with no drop off in performance. My new 7000/65c reedy packs will be here Monday to try out for snowbirds. The thunder power and speed zone packs were just as good. I've run Orion in the past and they didn't seem to do as well, however I'm really liking their weight transfer pack in my buggy!