There are two lakes in the Nashville area (Percy Priest is the "Stones River Reservoir" and Old Hickory Lake is on the Cumberland River). Don't know if you guys actually want to splash and test, but you could sure do it easily enough.
As far as a "place" to look at the boats, there are a zillion Target and Walmart parking lots in the Nashville area.
Restaurants, places to stay, etc - just let me know what your plans are and I'll try to guide you to em. I'd offer my shop to you guys to check and inspect, but I'm going to be in Orlando on Saturday next (otherwise, I'd want to ride in both of the boats).