I would say start with what you can get locally.

Step 1) What shops are in your area. Most stores carry particular brands. Besides Trek and Cannondale and Speciallized there are lots of others builders to choose from and each has different makes and models...Oh it's mind boggeling .... but first find out what you can get locally.

If you get your heart set on oh...a Moots or a Surly or a Waterford it may be hard to get in your area so go with what's available.

Step 2) Obviously you are online check the mfr's website and see what their product line is. Ask questions of the TE gals of course.

Step 3) Go out and try bikes

Step 4) We want to hear all the test ride reports.