Getting good rate during SEMA at the original 5 hotels you mentioned may prove difficult if not impossible as that outing brings a lot of visitors. The rate you have at the RIO is a good price during SEMA (but may not be comparable to the quality of the rooms you get in Reno. )
Without status/comps, and paying for the room, possibly Encore or Wynn would be my preference. IMO you will get a fine room, because they are all well maintained and appointed.
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