I've got the 340M&P and wouldn't trade it for anything. I shoot .357's in it they do have significant advantage power wise over .38+p's. They are, however, slower for follow up shots. You make your choices.
One can always shoot (as I do) reduced power .357 mag stuff and still gain a significant advantage over the .38spl. guns. I, myself, have chosen the 125gr. DPX rounds. Golden Sabre would probably be another good choice. They both kick a lot less than full house stuff.
Having said all that - money is not a big issue for me. Obviously it is for you. If you choose your ammo well (like Gold Dot 135's for short barrels) a .38+p gun would be a fine choice. You'd shoot it better and give up only a little in performance IMO.
Couldn't go wrong either way IMO.