Audio Note RIAA is very nice. Over your budget at 800, MM only.
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If you are restricted to a $500 budget, my best suggestion is an interim approach: buy a used Adcom GFP-565 preamp, and save your money until you can afford a much better tube unit. The Adcom 565 has an excellent phono stage (it got outstanding reviews in the audio mags at the time it was being manufactured), as well as a bypass output. A used Adcom GFP-565 preamp usually sells for around $300 here on Audiogon.