I almost forgot, if you just want to carry a .44 mag and not shoot it a lot (PAIN involved) S&W also makes several lightweight .44 mags these days. The nightguard series offers a lightweight .44 mag and there is also the 329PD.
Couple of links:
http://www.gunblast.com/SW-Nightguards.htm
http://www.gunblast.com/SW329PD.htm