The Sutherland N-1 may be a bit out of your price range but not by much and it is strictly single ended. Maybe the best preamplifier on the planet.
Check out the following links:
http://sutherlandengineering.com/products/n1/
Owners Manual http://www.sutherlandengineering.com/wp-content/uploads/2014/10/Sutherland-N1-OwnersManual.pdf
Check out the following links:
http://sutherlandengineering.com/products/n1/
Owners Manual http://www.sutherlandengineering.com/wp-content/uploads/2014/10/Sutherland-N1-OwnersManual.pdf