Lenco electric....(for your boat would be best) but you have to upgrade the switch to the one with the position indicator if you want to have them self adjust.
You can go to this site for a little more inside info:
http://www.bennetttrimtabs.com/hydraulicvselectric.php Had em on my Century 2201 bay and never had a problem. Most bays come with the electrics ...no internal mounting of pumps etc. Cost less and faster response.