Audio Research Pre-Amp advice

I would love a 28SE if I could find used at a good price. I just want to buy the best model in my budget of around 6k or less. Don't want too old because of service issues. I am just trying to find the best one within budget. I am not sure which model sounds best that's why I am asking people who have had experience with this brand. Thanks for your responses.

Thanks, I saw that but don't like to deal with ebay. I would rather buy a demo from a dealer if available and I am looking for silver color.

Thanks for all the responses so far but which are the best sounding built in the last 10 years excluding Ref. I want something easier to maintain, so in the future if it ever needs service. Ref's would cost more to service. Someone sold a 27 on Audio Mart maybe that one would one good to consider?

Thanks for all the comments I am leaning towards a 27 or 28SE. The 28SE is still a little pricey for me so have to think about it.