Single ended may or may not be the nirvana you expect. Many se amplifiers don't have good bass control and you can find many really good sounding push pull both new and used for your price range, not to mention a huge amount of really good affordable tube integrated amplifiers such as Cary or Cayin.
The Manly stuff is really excellent and the little Stingray can sound really good. Go find yourself a good dealer in your area and listen, buying used amps you don't know is a crap shoot!