Sharpie:
A Browning Citori XS Special or Sporting, 625 Sporting or Beretta 686E should fit your needs. ( 2500-3000 )
A little further up the scale, the Beretta 682 GoldE or Blaser F3. (4,000-6000)
Beretta DT10 ( 7,500 - 9,000)
Further up scale still, Perazzi, Kolar, Krieghoff ... ( 10,000 + )
The 30" Sporters are quite capable in all the disciplines, whereas a pure A.T.A-type Trap gun is a decided disadvantage at Sporting/Skeet/5- Stand.
I've previously owned a couple of adjustable comb guns, and a few with porting. Don't like either, and don't currently own either. Find one that fits you (or get it altered to fit), balances and handles. If it's a little long & a little high - great - tough to work from the other way round.
I've not found a flat shooting gun to be a disadvantage at ATA Trap, although 70/30 guns & higher are popular with some. My current gun is a DT10 32" Sporter. Don't have any great difficulty putting straights together at Skeet, and while I don't call myself a "Trap Shooter", I don't find shooting either ATA or International to be a chore with the 32" Sporter. It really shines at Sporting & 5-Stand, and is great for shooting "flyers" & flighted pheasant !
Just my 2 cents worth.