My answer is buy them all!
Many on here will tell you that you'll eventually own them all anyway!! Lol!!
I have a .308 (It's my first, but not necessarilly last Handi). After altering the forearm lug hole just a smidge, and adding an O-ring to the forearm lug, it's a dandy shooter!
The FAQ's are definitely helpful!
I didn't do the bore paste thing, but fired a couple boxes of shells and cleaned it a couple times between, and I got pretty good results. As far as factory ammo, I was always a Rem Corlokt guy, but it seems as if the Winchester silver box ammo shoots a little better in my .308.
I also had to send it in due to misfires. The fix was free and made a ton of difference with the trigger and accuracy. Not to mention no more misfires! Hopefully the new guns already have the upgrade installed.
Good luck!