Hi swamppro and welcome to the forum! TDRILL's recommendation on the Sidekick would certainly solve your standing problem. You can look at it here:
http://www.hobiecat.com/kayaking/access ... l#sidekick
There are three other accessories that IMO, really bring out the potential in all the boats: 1) large (sailing) rudder at $23 is the best bargain -- really adds lots of rudder authority, at low speeds (especially with the Adventure); 2) Turbofins (although ST fins aren't bad either) for better acceleration, higher speeds; 3) Scupper cart. this allows you to throw all your gear in the boat and wheel it right in the water for fast launching, easy portage.