New vs uses in your current setup

Probably 50/50 for me. When I was younger, I almost always bought new. Now, most of my 'new' gear is demo which has saved me a ton of money. I may not ever buy new again. 

In my system, the speakers and amps are new, everything else has been used.

ozzy

I do both.  I replaced a new amp with a pair of used ARC monoblocks, and I replaced those with a new Cary that I am still running.  I replaced a new pre with a used Cary, and I replaced that with another used Cary.  I replaced a three piece digital front end that I put together with new pieces with a Marantz that was a "factory refurb" (so I guess that counts as used).  So far my speakers have all been new, but I would consider used on those as well. 

Mine is a pretty even mix.  I am joining all the world leaders and claiming victory in my personal war (for good sound) just like them with their actual war involving big expensive toys that also make sounds ("boom").  My "intelligence" is the best.  Prove me wrong!

Current rig is 80% new 20% used of the major components; tt, phono pre, preamp, power amps, speakers.