The Siaga 12 is a civilian shotgun...
Perhaps you meant sporting-type shotgun?
If you're on a budget, the Mossberg 930 is a great shotgun for the money. I preferred it over the Benelli SBE II that my hunting buddy had.
However, since you're budget is $2k... I'd go with a FNH SLP, you can often find them used for around $1k or less. With what's left of your budget, you could buy a lot of ammo...
"To preserve liberty, it is essential that the whole body of the people always possess arms, and be taught alike, especially when young, how to use them." -Richard Henry Lee, Virginia delegate to the Continental Congress, initiator of the Declaration of Independence, and member of the first Senate, which passed the Bill of Rights.