The Sirrus does seem to have an incredibly long head tube. How does that translate in the ride? My Quick has a head tube that's not as long - I think 15cm - but as the forks are longer than a road bike it does add some height. Also Cannondale fit it with a riser bar. However I have put a flat bar on and recently took the stem about 15mm down the steerer to get it as low as possible,
Stu