Hi Sloan,
Unless you upgrade to a $700 or $800 table, whatever you buy next will come with a new cartridge. Additionally, a typical MM cart will only sound its best for 500 hours or so (basically a year of light to medium use). Is the table new or used? If it's new, I would wear the stock cart out. If the table is used, I'd replace the cart asap with the same model and spend the extra $90 on some cherry records at Fantasyland in Atlanta. Inexpensive tables need to be inexpensive to maintain or you start throwing good money after bad.
Chris