Combinations that exceeded your expectations?

Putting the right equipment together is a real art--mixed with a good bit of dumb luck. Fortunately, experience sometimes does help get really stunning results by matching equipment from different manufacturers. I'd like to hear what equipment (like speaker/amp or interconnect/speaker cable or source/preamp) when paired together others found elevated their system to another level. Though entire systems are interesting, I'd prefer to narrow it to the juicyest equipment you've had the good fortune to pair up--and by all means name names.