A cartridge capable of playing back a larger frequency range will sound better than one that has a more limited range. Stylus shape also affects how a cartridge sounds and how it rides the groove. In general, choose elliptical for better sound, and spherical for better tracking and a little less record wear. Tracking force denotes the weight range that can be properly applied to the cartridge and stylus. Prices will vary depending upon what sort of package you buy and where you shop.
All cartridges come with at least one stylus.
If a cartridge doesn't come with an extra stylus, consider buying a spare for any emergency situations. Most stores that carry turntables and other DJ equipment will have some selection of cartridges for sale. Needle Doctor claims to have the world's largest selection of needles and cartridges. Welcoming corrections, additions, and comments.