(If you're not buying one made by Mark I'll assume you're not buying a Talon. You may regret not getting the Talon.)
Back on subject, the Talon UL is my favorite kite. Though the Talon std. runs a close second. Personally I'd choose a Deep Space UL over a Gem UL. The Talon and the Deep Space are quite similar and suit my style of flying a bit more than the Gem does.
YRMV.
Denny