Try to find a 5" Model 29 Classic or Classic DX. They will come at a premium, but will be worth the bit of extra coin. They are pre-lock, and have the endurance package, as well as having a full underlug.
Based on your range and intended target, I would recommend a load of 10 grains Unique and a 240/250 Cast SWC. That load will kill any whitetail alive and be very easy to shoot well, and easy on the gun.
Eye candy:
BTW, we have a long running 44 magnum pics and discussion thread here at the fire. Just google it.