If you are just looking for a fishing boat, you can't beat a 21' supreme (fiberglass). It is  great for lakes like Taney Como or any where current is present. It also works well on the white river below Bull shoals dam. Shawnee is another good boat of this type. These boats work great with various size motors (9.9 - 25hp seem to work best). I recently saw an aluminum boat made by blazer boat company. It was 18' long John boat. All welded construction heavy guage alum.  It had a 40" front deck, a 18" rear deck and a 56" beam . The rest of the boat was open for spider chairs. It looked like it would work great on Taney Como. It was about half the price of a supreme. I haven't gotten to fish out of one of these but hope to some day.  
 
Thanks,  
 
Mikefink