I have found single triggers on side by side guns problematic.
The Miller single trigger has a good reputation though.
My recommendation would be to get double triggers. I don't recommend this because the single makes you a heretic but because, in my experience, single triggers on doubles are a problem (except for the Winchester 21).
I had an SKB 28 gauge SxS with 28" barrels, pistol grip, vent rib, and single trigger. It didn't work at first but after cleaning and lubrication it was flawless. I took it to Cordoba on a dove shoot and fired several thousand rounds through it. The gun weighed 7 pounds.
The Parker Reproductions 28ga with 28" barrels and pistol grip are available and come with either single or double triggers. I had one with a single trigger and had to send it off. The gunsmith cleaned it and it was fine after that. So that might work for you too.
If you do decide to go with double triggers the AyA No2 with 29" barrels at Cabelas might work out for you.
