You'll be glad to hear that there's a huge variety of both economy and high-end rentals in Potosi. What you end up going for is largely dependent on how much you're willing to spend as well as what you plan to do. Specialty and prestige vehicles offer unparalleled mod cons and comfort. If you're splurging, why not pick up a fully kitted-out SUV, or perhaps an upmarket mid-sized vehicle? Otherwise, if you're just after something to get you around town at the cheapest price possible, maybe go for an economy compact vehicle (or something else that won't burn a hole in your pocket).