$500 buys a genuinely good bass today, new or used. The budget lines from the big makers are well built and gig-ready, and the used market stretches the same money a lot further.
Series worth starting with in this range include the Squier Classic Vibe and Affinity basses, Yamaha TRBX and BB models, Ibanez SR and GSR, Sterling by Music Man (the more affordable StingRay-style line), and Schecter. Used, $500 can also reach some Mexican- and Japanese-made Fenders.

