An Alby still in cosmo? Jump up on it!
I look at a trade from what I have in it, what its worth and if both partys walk away happy. Albys arnt cheap but play up the S&W value and get the stock and hand guard tossed in if its an option. With $400 in the pistol, I'd be happy with a straight trade and both partys walking away just near bandit status
If he's itiching for the pistol, I wouldn't worry about selling it but if he's cool with cash or trade either way...sell 'er off and pocket what ya can.
Edit: Just saw your post....
No regrets in that trade at all brother, Good for you man!