I found the only way was with V-box; couldn't find a single 36 volt HD Rx on the market. Have successfully used V-box with FortecStar Passion and Innovation Rx. Used to use a Manhattan ST550 which I thought was a very nice box, albeit with a pretty naff PVR facility.
Only snag with V-box is that I've found the actual positioning, although consistent, to not be very precise; the individual steps are perhaps a bit big.