Replacing Everest in our labs is AIDA64. This new testing suite is from the core development team from Lavalys and continues that tradition. The guys have thrown in better support for multithreaded CPUs as well as full 64 bit support. We use this to test memory and HDDs for now, but may find ourselves opening this up to other areas of the motherboard.
USB 2.0 performance is even across the board. As for SATA performance, it's best when everything is left alone. Overclocked, it drops back a little, but if we throw our own VGA card back on it jumps back up.