I have a 26 year old TFM 15-CB. Just had it refurbished for about $400 maybe eighteen months ago though I had a stretch where it was in storage and didn't need to have mine recapped. Wonderful amp and for the money, it is really excellent.
My issue with the Carvers is that I tend to get a little hum that just won't go away. In the same power strip, nothing kills it. You may find that a more modern integrated amp will do the trick if you are looking for an upgrade. They will be quieter and give you sound that is as good.
For the money, Rega would do a nice job and give you a similar sound profile. They offer a few integrated amps that are outstanding and the Elicit R would give you the power you are looking for. I moved from using my carvers every day to a Brio R and it was quieter and as resolving. Just not as powerful. The Elicit R will be a bit more powerful.
There are a million other integrated amps on the market. Knowing the Carver, I think you will like Rega. Seperates in this price range will not be a huge step forward and your best value will be with an integrated. Though, if you are hell bent on separates, Vincent is probably your best bet.
Marantz, Rotel and Arcam also have interesting options for integrated amps.