HB wrote:To what end? Would you hope to assert, for example, that basket diameter is a more important contributor to exceptional espresso than the pump type?

Exactly.
Isn't that pretty much mentioned at least once in 90% of the postings?
Something like "pump type is much less important then basket shape". I figure we might as well have one source to refer to when bringing up these things.
I understand not everyone likes lists, and they can be very subjective (i.e. Top 100 movie of all time, etc). But still, it's good subject for debate as well as an eye opener for the uninitiated.
If nobody is interested, then this thread will die a natural death.