What about Marantz?:scratch2: The 1180DC, 1250, and 1200 are all within your budget. The ultra, ultra-rare 1300DC is the best one but very, very expensive.
To be perfectly honest, I've never really been enticed by Marantz. I'm not even sure why exactly.
The Accuphase is definitely a pretty amp. The lack of phonostage isn't a huge deal, when I could easily pick up a pretty great pre-amp for under $200, which I'm planning on doing anyway, (possibly the Cambridge Audio 640p).
I can't seem to find one for sale anywhere though. The only two I've found so far are on ebay, which is pretty famous for asking too much for vintage equipment. The one up now has a starting bid at $500 and a reserve set higher than that. No information of whether it has been serviced, and local pickup only. There is one for sale in Japan, but the asking price is +$2000, which, even though it has been serviced and comes with a 1 year warranty, seems outrageous.
Maybe, trying a Sansui AU-717,719 or a Kenwood Supreme would be a good plan. You can resell either of them to recoup your cost and it will give you another set of impressions.
I have the dual-transformer AU-719 and it does not have any sharp edges to it. The same could be said for the Supreme. The Kenwood 500 had great tone and was as close to a good tube amp as I've heard. The 719 has balls.
Maybe I missed it but what speakers do you plan to drive with this upgrade?
Good point. Sansui amps are pretty easy to sell. It wouldn't be very hard to recoup my costs if I ended up not liking the amp very much.
As far as the 719 goes, I've heard it is inferior to both the 717 and 919, but that an 819 would be a good in between, even though they are quite rare.
The 717 seems to be the most easily available of all of them, and the 919 pops up quite often. I'd lean more toward the 717 at this point because of the much discussed reliability issues with the 919.
With the Kenwoods, I have heard great things about the Supreme series. Apparently they were the best Kenwood ever put out. Prices and availability reflect this, however.
EDIT: the speakers I am driving right now are HPM-100s. I do plan on upgrading them as well down the line, but it could easily be a year+ before that happens.