For a center fire 1911 that would be easy to get affordable ammo for, I would recommend one in 9mm.
Also another factor to consider in ammo choice besides price is how many different loading a can you find in target ammo and defensive ammo. Then magazine availability, quality and price us a potential issue as well. 9mm ammo and mags are fairly common.
Last edited by SSGN_Doc; 10-08-2012 at 02:39 PM.