Hi,
If you have a high efficiency speaker, you should try the tube amplifier, within your budget, I know the Space-Tech Lab. products might match your requirement, just check "http://www.space-tech-lab.com" , they have a pre-owned equipment section, there list a lot of used equipments. But even their new equipment is selling with very low price, I have heard those equipments in their showroom, they sounds great , really liquid transparent, rich and warm.
If you have a high efficiency speaker, you should try the tube amplifier, within your budget, I know the Space-Tech Lab. products might match your requirement, just check "http://www.space-tech-lab.com" , they have a pre-owned equipment section, there list a lot of used equipments. But even their new equipment is selling with very low price, I have heard those equipments in their showroom, they sounds great , really liquid transparent, rich and warm.