I'd get a mint 172 over a ropey 182 with that budget.
Yes, if its been serviced. I got mine with 134k on it and very little history, got it serviced and just stuck a new exhaust on it and its spot on. Though if you're struggling to afford 2.5k to buy the car, it might be worth asking yourself if you can afford the running costs/ repairs that are a pre-requisite to car ownership regardless of mileage......... Does it have to be a 182?? You might get a 172 or cup with more history for the same money. Cambelt history is one of the biggest things to have, as its a massive bill if it goes wrong (new engine).