A lot of the Ebay and Tenzo type seats are much cheaper. The supports arent as firm and the material on the seats is much thinner and not as nice. This can sometimes lead to an uncomfortable seat.

In terms of reclinable seats, most are heavier than stock. If weight reduction is what youre looking for, most buckets will accomplish that. Lightest possible seats would probably be CF or Carbon Kevlar...in other words big $$$. Spoon, Bride, OMP, etc make these seats.

Whatever seat you choose, you should have the harnesses mounted properly, with a rollbar as well. Racing seats with harnesses and no rollbar make for a dangerous equation in the event of an accident.