You might try Phillip at Duskin Point Marina on Smith Lake. He is an area dealer for the Hydrahoist lift system. I have personally used the Hydrahoist and the Hewitt Boat Port. I think they are the two best lifts on the market. The Hydrahoist lift lowers directly under the boat, where the Hewitt is a front mount lowering from the rear first. You can get either installed for around $5,000. Tell Phillip the referral came from Arley.
Got ours through overton's several different choices. Putting it in this weekend. Hopefully all will go well. Overton's says that it takes 4-6 weeks for delivery yet it came in two days standard shipping. Good Luck.
Fountain is correct about the water depth. I should have mentioned that. The Hewitt Boat Port will work with 18" or more according to the literature. We have around 75 ft at our place so I can't validate.