"I'd be more comfortable under $300."
If you look at the listings, 2 in your price range. There is a Marantz for $350. Prices are always negotiable.
If you're adventurous, a true "vintage" Sherwood for $250. The Sherwood is tubed, so it will produce a sound unlike other inexpensive SS units. Tube tuners, subjectively, have a more "organic" or convincing presentation.