I picked up my 700 MLS at Cabela's for $399+shipping. They'll include a 209 ignition kit if you use the clearance sale number --- RC-21-4463 but is in .50 cal only (good through Aug 25th).
I think the .45 is available in the new magnum version but where I don't know--it comes with a 1:21" twist. The .50 cal would be a little more versatile in my opinion. Most states don't allow a .45 cal for Elk and lots of states have restrictions on what you can shoot out of a .45. With my .45, I never came across any conicals which would shoot decent at that high twist. But, I was about to try really, really heavy 450 grain - 510 grain conicals for the fast twisted .45 but didn't do so before ridding of the .45. I heard of a fellow who had great results in his Pedersoli using those heavy, long conicals in his .45 using around 90 grains of powder. You'd need a quigley-like sight to get any decent range results with that type of drop.