If you want the best performance for the category and bragging rights, pick up a .475 Linebaugh.
If you just want something bigger, and don't care what anyone else thinks, find yourself a good .480 Ruger. More tame. More reasonable. But still a step up from .44 Mag.
And, since .480 Ruger runs at reasonable pressure levels, it can be had in .44 Mag/.45 Colt size revolvers. The Ruger SBH, I believe, was only offered as a 5-shot. The Ruger SRH was on the market as a 6-shot, then a 5-shot, and then again as a 6-shot. I think most other makers (half a dozen of them?) only ran 5-shot versions.
Personally...? I opted for the 7.5" Super Redhawk, and the one that I decided was the best balance of price, condition, location, etc. turned out to be a very early production 6-shot that was sitting in a pawn shop in South Dakota. (That did, however, require weeks of scouring the internet, classifieds, and auction sites; because I couldn't find one locally, couldn't order one, and even those scattered across the country were priced crazy high - or crazy high for condition.)
It was caked in nasty filth, but turned out to be in near-new condition under the grime and slime.