Help wanted buying a 430 4matic

Dear Mercedes specialists,
after having driven a 83 190E 2,0 (for Germany) for more than 20 years and 500.000kms without much trouble we want to have a second car for
transporting two of our horses (with trailer around 2.000kg) and thought about a 430 4matic, because we often have to drive in wet grass when we are going to transport them.
Are there any suggestions which years should be avoided or is it only a question of kms?
When we dont transport our horses, we like fast driving, we are living in Belgium and have to drive to our workplace something about 50 kms, most of them on german "Autobahnen" with no speed limit.
Any answer will be appreciated!
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