I've been to Argentina for doves. I know that Uruguay also has some good places, but there's no point on going there for doves only, unless you want to combine with ducks, pigeons and perdiz. If interested in Uruguay you might try to get a copy of " the best wingshooting in Uruguay".
For doves, Cordoba is your place, and there are a lot of options with different outfitters. They all offer more or less the same program, and prices vary considerably due to accommodations, overall quality of service etc.
Be wary of the low end of the thing...If it's priced lower than most, be suspicious.
By all means take your guns, it's trouble free, and you'll enjoy them a lot!
My only advise would be regarding the gauge. There's absolutely no use for a 12 gauge in a SA dove hunt. Take a 20 or even better a 28.
Same applies to your wife, no problem whatsoever on taking her with you, but just be sure that she will be ok staying in the middle of nowhere for a few days, shooting and talking about it all day long.
BA is great for 2 or 3 days, and she will enjoy it for sure.
As mentioned above, I usually go in June-July to combine with ducks and perdiz.
Like Joe Wood, I've stayed a couple of times in Los Chanares and can only say good things about it.
HM