The single best resource I have found for shopping is PPL's website. Big inventory, accurate descriptions, floor plans, historical pricing, etc.
http://www.pplmotorhomes.com/
I have no business connection to them. I have sold two RVs through them, have been to their lot maybe a dozen times for shopping, and have been to their website hundreds of times.
We went to some shows, and learned a lot. A $250K motorhome may not have enough headroom for a 6-foot person to stand upright in the shower. A $150K motorhome may have little piles of sawdust under the cabinets just from the drive to the show. A $150K Class B may be real easy to fall out of. Some of the expensive ones are too elegant - I don't want white carpet, leather furniture, quad slides, etc. I have no need for a faux fireplace.
The single biggest influence on what I now look for in an RV was a used, private party for-sale we saw in the parking lot of a show. It was an older Beaver DP, and it was %$#@ beautiful! It looked like it was made to last forever. Over a decade later, and I STILL want that built-in blender!
Matt B