Equivalent or better

Thinking towards the future, I have an old ARC CL-60 tube amp that I’m sure will one day crap out on me and require expensive repairs. Assuming the price to fix begins to question whether not to buy new (or used), if  I wanted to replace that amp today what would be the minimum I would have to buy to equal what I have sonically with today’s new equipment. When I say minimum I mean dollarwise and component wise.  Understand I have no option to go and listen to anything very easily so items I could easily order over the Internet and return if I didn’t like them would be preferable, but not absolute.