I've run a 4.1, 4.3 and a 4.77 in my ITA Miata. I ended on the 4.77 because it allows for a good top speed...and I can win races with it, where I couldn't win with the 4.1 or 4.3. I chose the 4.77 over the 4.87 because Mazdaspeed was back ordered on the 4.87 and I could buy the 4.77 from a local guy for $100 less.
I do run out of gear heading into some corners, but my lap times are lower and I'm closer to the front of the field, so I'm happy.
EP 1990 Mazda RX-7 (used to be STU until the turbo cars scared me away, and STL rotary cars require too much ballast)
ITS/T4 2004 Nissan Sentra SE-R Spec V
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