Your gun laws I am not familar with, nor what is available, so please forgive me and correct as need.
I am thinking a bone stock pump shotgun with perhaps two barrels - which we call "combo" guns here in the US - might work. Here in the US Remington, Winchester and Mosseberg sells these. Long barrel for clay targets and hunting flying game, and short bbl usually with rifle sights for deer and some use for turkey. They do make a Turkey combo as well with long/ short bbls.
Smoothbore barrels are more versatile in load selection.
Now I am not sure of magazine limits in Sweden, here in the US we are restricted to 3 shells total being able to be in the gun for waterfowl and migratory game birds - we have a 'plug' we insert into the magazine tube to restrict the number of shells.
Just thinking a pump would be less monies, for a reliable , quality firearm that is not dependent on ammo, and affords repeat shots being fired. Hate to add...might look more PC being a 'hunting' shotgun.
HTH.
For humor, and no disrespect intended, we have an old closed thread, that your thread title reminds a lot of us of.
http://www.thehighroad.org/showthread.php?t=58023&highlight=Ultimate+Shotgun
Just something for fun - even though there are some very serious ( albeit heated) advice and considerations to be learned.