I went with a Spuhr mount on my 50BMG after it flexed it's last optic apart in a set of Farrell rings and haven't looked back since. The quality is outstanding, it's completely modular, it provides a level of support and rigidity that you can't get from rings and bases and the anti-can't level is an added bonus. The mount is designed to allow the shooter to easily see their turrets since the ring design is squared off rather than round unlike other manufacturers, a big bonus especially if you spend a lot of time in the prone like I do.
Lots of added rail products from Spuhr mean that you will have no problem adding an angle cosine indicator, back up irons, red dot, laser designator or NVG devices or anything else if you so choose. I opted for the 6MIL (20MOA) setup since I have it mounted on a 15 moa base rail but you can get 7 MIL and 11.6 MIL variants if you need more elevation.
All in all it's a great product designed by a great company, the fit and finish is excellent! I would not hesitate to buy another one (in fact I will be once I'm done building my current project rifle).
My .02