I agree that the Robinair pumps leave a lot to be desired. Mine is a POS; it's loud, spews an oil mist, and gets pretty hot on its own, let alone being encased in styrofoam. Totally unsuitable for an apartment\townhouse. A good pump I've been using (can't remember the brand) is one of those used by phlebotomists. I don't know exactly what they use them for, but they are compact, very quiet, and pull a very strong vacuum. However, the volume of air it will pull might not be that great. They are perfect for filtering purposes, though.
I'm now thinking the brand may be Gomoz, but I don't believe that that's not quite right.
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What exactly are you meaning by "Aspirator"?