I agree with KnightRider966 and his assessment. Remember, you have a very unique car there, and all those 190's chunk a tranny 150K to 250K a large percentage of the time. I wouldn't buy a used one for just a few hunnert bucks less than a rebuild, the few extra hunnert is worth it.
What color is your 190D. I drove an '87 a while back with only first and third gears working, and it was still a little rocket. I really really liked that car! Hang on to it, it's one of the fastest diesels made, and the fastest of it's era. They drive well too........

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John