Pontoons are great. We have had one for the last 10+ years. They do require some upkeep and maint. A storage slip on the water is a must. We own three at Little Bridge Marina. Since we bought them, they have quadrupled in value. That said, if you do keep one in a slip, be sure and spray for spiders. They will ruin your seats in a hurry.

There are many pontoons in the 21-24' range that would be adequate for what you want. Hard part is staying at that $10K mark. You will not get a tritoon for that price.