You want modular design that will accept a large number of accessories including Ram, Scotty, and their own brand look at the YakAttack Mighty Mount/GearTrac's
http://www.kayakfishingsupplies.com/...kAttack/Detail
These will accept so much stuff its not even fair. Plus you can bolt MM's to tracks to creat dashboards and such. Works REALLY well. We install 100's of these things. There is a reason they are the fastest growing accessory company in the industry. Plus it is all 100% made in the USA so you cant beat that.