Actually, I recommended Deluxe Plus.
I've never used Metal Masters, but as I understand it, Metal Masters are in between Deluxe+ and Ultimates in terms of noise and friction, but closer to the Deluxe+ for dust. Deluxe Plus are dustless and not noisy (although after autocrossing on the mtwice, mine are making some noise in the Miata) wear slow, and they are CHEAP.