Trolling motor advice-inflatable pontoon

[monkeee2002]

OK, so I talked to Dave Klein at Buck's today. INCREDIBLY helpful gentleman!
Since I bought my boat used, I don't know what "gen" it is, and apparently there have been some big changes.
He had me take some measurements and pictures, and is going to have to fab up a mount since my boat is so old, but he said it will only take a couple of days.

Now on to the motor. I've been watching CL for some "deals". There are plenty of motors, but no "deals".
I see 30lb thrust motors going for $100 used. I can get a new one for $110.
I see some older (white-top) Minn Kota motors going for $65-75.

I fail to see where saving $10-25 is worth not knowing how much life a motor has left. Am I missing something?
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