The current issue of Stereophile magazine has a review of several moderately priced phono stage preamps, and they've had favorable comments about a relatively new model called the Gram Amp. It's made in England and has a MSRP of $295. It ain't much to look at, and is best suited for a MM cartridge (which yours is), but for under $300 brand new it looks like a good option. I suggest you pick up the current copy of Stereophile and read the article for more info.
If you find you can stretch your budget to around $350-400, then I'd suggest you try to acquire a used Lehmann Audio Black Cube. This is an excellent buy in a used phono preamp, and it offers substantially better performance than the Gram or the Creek models.
If you find you can stretch your budget to around $350-400, then I'd suggest you try to acquire a used Lehmann Audio Black Cube. This is an excellent buy in a used phono preamp, and it offers substantially better performance than the Gram or the Creek models.