The Kubota has a lot of extra equipment, but a lot less hp than the Deere tractors you mentioned. It depends on your needs. On the choice between a new 5103 and a used one, see how much you can get thrown in on the deal, then compare. If the prices are the same, get the new one with the warranty. If they'll throw in things like a box scraper or other equipment, then get the used one. Either the 510 or 521 loader will fit the 5103.