Arty

Hello members, i have just joined the site as I am about to buy a 2000MY Wrangler (manual, preferably a hard top). I have heard all the stories about soft rear differentials and leaking air con eveporators. In the eventuality of these needing replaced, where is the best/cheapest place to buy these and other spare parts? Any other problems on this year I should look out for? Engine should be bullet proof I imagine?? Regards, Arthur.