I tried a number of quality O/U's during the 90's including several Kolars, Kreighoffs and Perazzis. I had previously owned Brownings, Winchester 101's, Clasic Doubles and a couple of Berettas, of which I liked the old 682 Gold best of all. I had my heart set on an ASE 90, but come time when the cash was there, they were discontinued and I couldn't find one for love nor money. In 2000, I decided on a DT-10 ... and it was immediately off to the gunsmith for a change in comb height, cast off, length of pull and pitch ! They have to fit !!!
Very happy with the DT-10, but have continued trying other new guns & refinements that have come along. No need or desire to change so far. Like Claybuster, I also have a 391 (actually a pair of them) that I also shoot well, but so far can't convince myself that the A400 is any better !
For the money, I would encourage the original poster to take a hard look at either a lightly used (and not abused) 682 Gold or 682 Gold E Sporter with 30" barrels.
An adjustable comb would be an asset ( and one can be added fairly economically) to achieve a better fit. Such would seem to me to be ideal for what he's looking for, and perhaps a bit less $$$ than a new SP1.