I know with my toons I have 30 to 50 each with 1 to 5 of those being cd macros or things of that nature. For most classes just interrupts, offensive and defensive cds and any sort of purge/debuffing type of spells will eat up 10 things.
---------- Post added 2013-02-19 at 10:38 AM ----------
The logitech version of the naga is far more reliable and slightly cheaper. It is hard to not pick the choice that cost less and lasts longer.