Well, I'll throw you my choice - and will also be starting a 45 cal for hunting as soon I get my barrel from Rice.
I opted for an A weight Southern Classic in 45 cal.
Although an "A" weight it's actually kinda in between an A and a B. At 42" the swamp is less pronounced (see pic), it comes in at about 4 1/4 pounds (Jason estimated 4lbs 4'ish oz) in the 45 cal, and given the profile you can get both your front and back sight on the same plane (barrel width is .800 pretty much at the point where you would put the sights).
Recoil is not bad on a 45 so I didn't feel I needed the extra weight.
It is only available from Rice, but Jason is getting tooled up to do a run of 42" barrels right now - so just a phone call away, and the wait time would be quite short...