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I went 4.56 in my daily driver... but if I had it to do over again I just may have gone 4.67. I wanted quiet so I used the Toyota set (same as Cusco) - helical cut and as far as I can tell no noticeable increase in gear noise over stock.
I mention this because I did not see noise listed as a concern for you. I like my 4.56 gears, a definite improvement, just perhaps a bit too mild.
I would be a little hesitant of 4.88 on a daily that saw lots of highway miles.
Tough choice, and the only way to know for sure is to drive them. As far as the freeway noise and gas milage goes, you can simulate that by just not shifting into the higher gears and running the approximate RPM of the final drives you are interested in on the freeway.
Good luck!
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