I'll respond as I'm wondering too. I had an '03 Gemini 900; the stock stem(110mm? C-Dale)& bars(Funn Serial Rippa, IIRC)worked well for rides leaning towards XC/AM, and for jump/play I had a Race Face Diabulous 50mm(?)& some BMX DJ saddle on a cheap, short post. In 2 minutes I could go from one extreme to the other. I'm in the process right now of getting an '05, though, & would like to have the same quick-change capability for this rig.
Actually I abhor cycling- I just like wearing tight shorts
Was running a RaceFace Diabolus DH 70mm/10deg stem and STD ultrawide bars with the Manitou Breakouts.
Quickened up the stearing nicely and because the bike no weight weenie I couldn't see any reason to replace the bars
Now has a lefty 140 Max fitted, so gone back to the STD type C'dale lefty/headshock stem, think it's a 90mm /15deg, again with the STD bars.
Would like to try a stem that doesn't rise as much though.