I like the Whisper AP 300 dual outlet (or AP 150 if you want a single outlet) pumps. With any luck you can catch one on an e-bay auction for under $50 (I've gotten several that way) and I've never had a problem with any of them. Been using them for years in my 75's and 90's, even in the 220, with not so much as a worn out diaphragm.
The Whisper blue dome models are junk, don't waste your time/money on those, but the AP models are completely different.
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