Lots of good ideas posted on this thread.
However, I think if you follow the link to Whammerdyne website and read what they have to say about their SET amps you'll find that their are designers who are not simply recycling older designs.
And, having read much of the thread on the Decware forum about their upcoming 300B amp it sounds like it, also will be pretty killer.
I also think there's a lot to be said for something like an amp from Aric Audio. I love the looks of his equipment and have read nothing but positive comments about his gear. Haven't heard them, but what I read "ticks all the right boxes".
I'm sure there are some good options out there in your price range. Have fun hunting for them.