Well, I sure find that target version there to be quite a looker. Speaking personally, I find the New Model Super Blackhawk a bit too heavy and a bit too noticeable in carry mode when I go about my business. I have been looking for something a little lighter. A while ago, USFA announced they were going to release their Shooting Master in 44 mag, they have one in 357, which is great, but nada in the 44.
Colt has not seen fit to ever continue their 44 mag SAA project, and so that pretty much leaves Aldo Uberti or bust.
This recommendation, and excellent photo, is moving me to closer consideration of the Callahan.
How about a used Vaquero? The New Vaq is a sweet gun, but the old one was completely safe with .44 Mag and hot 45 Colt. I had one of the first made in 44-40 and owned a couple in 44 Mag. as well.