The chances are that the odo reading of all 3 of those cars have been severely messed with. Seriously, a 7-9 year old car that has travelled less than 40 000kms?
98+ will have a little more power (206kw vs 172kw), slightly better fuel economy and (should have) a triptronic auto so if that floats your boat then go for it.
As for the money, look around at everything else on offer and that will be the best way to judge it, but if you are likely to want to mod it at all, you would be a lot better off buying one like Andy's (plus, the manual version is a lot more rare and expensive)
Andy^^ Note free plug!