Two more notes --

looking at the photos side-by-side, it appears that the top tube on the Sirrus angles upwards, as compared to the more flat Lucas Valley. The lower, less-upright angle of the Lucas Valley is my preference, I think.

For what it's worth, here is the geometry info on the bikes. Note that the Sirrus has a significantly (? - 44mm) shorter wheelbase. From what I understand, this would provide better handling, but reduced high-speed stability. ??

Lucas Valley:
17.5"
Head Angle 71°
Seat Angle 73°
Top Tube 552 mm
BB Height 292 mm
Stand Over 775 mm
Wheel Base 1060 mm
Chain Stay 438 mm
Seat Post 27.2 mm


Sirrus:
M
Stand Over Height 760mm
Top Tube Length* 545mm
Head Tube Length 140mm
Head Angle 72.0°
Seat Angle 74.0°
Wheel Base 1016mm
Chain Stay Length 425mm
Fork Offset 50mm