Hello, I forgot to add that there's actual mips64 HW (Cavium Octeon-based MIPS64 systems) available in the form of the ubiquity routers. OpenBSD supports some of them already, and it looks like nice hw (4 cores @ 1GHz, 1GB RAM). Look for ER-4 or ER-6P, but not the ER-X line as the CPU is not the same and less interesting.
-- Vincent Legoll