There is a semi-rare variant if you want a 44Mag. The 50th Anniversary 44Mag Blackhawk made in 2006, NOT marked "Super", has a 6.5" barrel and the exact same grip frame and grips as the New Vaquero. It's the only factory 44Mag Ruger ever set up that way.
http://www.gunsamerica.com/96507799...khawk-Type/50th_aniversery_flat_top_44mag.htm - click to make the pic viewable - $500 for this gun is reasonable as it appears to be cherry.
http://www.gunblast.com/Ruger_Flattop44.htm - complete review.
It only came with a 6.5" barrel in blue. A fair number were made, so...you CAN find 'em.
It's a very interesting piece in a lot of ways. It was the first large-frame Ruger SA to get the new improved cylinder making process as was started on the mid-frames (New Vaquero and the like) in 2004. It is the only large-frame with a side-warning barrel that has the new process - in all the others, an under-barrel warning billboard tells you it has the new type cylinder.
Accuracy is excellent on these. Strength is identical to a SuperBlackhawk - it's a true "large frame".
Sights are compatible with the mid-frame "Flattops", such as the 50th Anniversary 357 Blackhawk or any of the 44spl Blackhawks. To my knowledge it's the only large-frame "flattop" Ruger made recently. It even has the "index click" system from the mid-frames, where the shells line up properly with the loading gate on each click.
WARNING: you will want SMOOTH wood grips for this if shooting real 44Mags! The factory plastic "cheesegraters" will rip you up. Altamont Grips has very good wood grips for about $30 - order the ones for the New Vaquero.
You can also, if you want, swap to a lower-slung hammer such as the SuperBlackhawk type (mostly a drop-in) or the lower-yet Bisley (slightly harder to fit but still an "amateur-grade job"). I've seen pics of these with the barrel chopped even with the ejector rod housing (4.68") and they look great that way.
Supers with the 4.68" and 5.5" barrels have the XR3-RED grip frame which is slightly larger than the XR3 "New Vaquero" type grip frame - which is really near-equal to the Colt SAA grip frame (2nd gen forward).