Another recommendation for Zesto. I have owned the Andros 1.2 for almost 7 years and have enjoyed it a great deal. It sounds wonderful, has been 100% reliable, is easily adjusted and has the flexibility for loading and gain to accommodate just about any cartridge.
A used Andros 1.2 would be well within your price range and even a used Andros 2, which has the new power supply, could be had at the upper end of your price range or close to it.