Is anyone else realizing that the 10 speed road configuration makes it very expensive to get lower gears by changing out the rear cassette like most other 9 speed bikes? I really don't have the money to dish out for a new shimano 105 BB and triple crankset + front derailleur. Or any brand of the above said parts really. Does anyone know if 10 speed mountain cassettes will be a possibility in the near future (say before next spring?)? Or will mountain bikes find a 10 sp config kind of useless, as it is.