I have a 2000 GT 3.8 and I tested the blower motor and found that it is bad. I read about how the circuits work on the posts here, but I don't see which part to go with and so I was wondering if anyone had any opinions.

The one I took out looks exactly like this:

Car Blower Motors, Air Conditioner Blower Motor

I picked one up from auto store and it looks like it doesn't seal quite the same, should I care?

VDO PM2714 - Blower Motor 2000 Pontiac Grand Prix | O'Reilly Auto Parts

Also, I want a whisper quiet one, and I see Auto Zone has a couple models, one for 69.99, the other for 99.99. Is it likely that I'm just wasting $30 by getting the more expensive one?

Blower Motor | 2000 Pontiac Grand Prix 6 Cylinders K 3.8L SFI OHV | AutoZone.com