Welcome to the site.
I've had 2 boats regelled in the last few years. For a ballpark number you can figure 150.00 per ft plus 50.00 per ft for each additional color. Thats taking the boat in stripped.
First boat was a 20' Advantage, 4 colors with a fade and pearl, bottom trued up, and stainless rub rail 6200.00
Second boat 19' Rogers, 2 colors with a pearl, and gelcoated stringers, transom and front bulkhead. 4500.00
With the way the economy is, i'm sure weather you go gel or paint you can work the price.