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I'm not really a huge fan of the sound.

Getting a sub-$100 phono preamp likely will not do much to improve the sound as the turntable itself presents significant limitations.

That said, if you are looking for a stereo receiver with a decent phono section, the Harman Kardon HK3490 is on sale right now on the web for under $300. The phono stage in the HK3490 is likely as good as anything you will get for under $100.