Your about to open a whole can of worms here so be fore warned.. get this no get this one it's better that one sucks etc.
Try e-bay. I found a heck of a deal on a Mustang 3 piece set up. Driver's seat, passenger seat, and driver's back rest brand new for $320.00 !!!!!! Sells for $685.00. My Wife said the same thing about the back seat. I think she called it " A *$%#@ BRICK " :shock:
Bottom line is ANYTHING is better than stock when it comes to the seats. Gel-pads will get you by for a while but you will just end up buying a new seat later. The two most popular seats are Ultimate and Mustang. To answer your question though Mustangs keep with the over all look. The Ultimates have an X stiched in them and doesn't look bad. Plain or accented it's your choice.