Don,
The Wake Designs Monsoon is a great "Custom" tower. They will manufacture it to exactly fit your boat since Wake Designs works off of measurements.
Wake Designs currently does OEM towers for Tige but they sell many custom towers for boats like yours.
There are many towers that will work on your boat. Besides quality, you need to find the style of tower that you like on your boat.
Mike
http://www.wakeside.com