would any of you recommend any company that will do a nice mixdown for one of my progressive house tracks? Maybe something you guys have tried and liked?

I can recommend Michael Dow's Alderney Studio: http://alderneystudio.com/
I recently had one of my tracks mixed and mastered there with great result.

http://www.shayneberry.net/

Shayne is very good at what he does.

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Processing a highly structured and complex pattern of sensory input as a unified percept of "music" is probably one of the most elaborate features of the human brain.....understanding how music is perceived and how it may elicit intense sensations is far from being understood.