A good all around gun would be a semi that can shoot 2.3/4 ->3.5 inch shells with interchangeable chokes. it may not be a only trap gun, but it will let you shoot trap, singles and doubles. skeet, sporting, 5 stand, international trap and skeet. and will also let you hunt. the only thing with a semi is you need too pay more attention to it as far as cleaning goes, because you don't want it too jam.
personally i use a perazzi MX15 for singles handicap, i have mx2000 O/U barrel for doubles. and for hunting sporting w/e i use a beretta Xtrema.
imo for you try a semi first I'm sure your local club has members that would let you try their guns for fit maybe even a couple rounds. but be aware that if you have a semi it takes more TLC than and O/U but if u pick the right semi it is more versatile than and O/U.
and it has been my experience that a true trap gun does not shoot hunting loads.
imo browning makes nice "gold" series guns. and berreta makes nice semi's also. don't forget if you plan on becoming a yearly shooter it might be worth it too spend a little more upfront too get the gun you really like.