I have a Mastersound 845 which is a wonderful SET design. It may be just above your price range but they also have a number of cheaper units in there range
The Due Trenta SE retails for just over 3 thousand pounds (English) which I think is round about 4 thousand dollars
http://jordanacoustics.co.uk/products/amplifiers/due-trenta-se-rc/
They also have another 2 integrated a couple of thousand quid cheaper
http://jordanacoustics.co.uk/products/amplifiers/due-venti-se/
http://jordanacoustics.co.uk/products/amplifiers/dueundici-rc/
I'm from the UK so the above links are for the UK importer, I would imagine Mastersound have a US importer
Mastersounds web site is
http://www.mastersoundsas.it/
Beautiful Italian styling combined with sublime sounds = happy listener
Cheers
Mark