Re: Just don't dig the C5
A2's are usually too dark in LP's. For more warmth (less treble and more mids) and a richer, fuller sound, either A8 or UOA5 are the best mag choices.
An A8 will make your C5 a 'C8', a very popular PU here, arguably the best of the Custom line. Besides the other qualities (above), it'll add a little output too. C8's are great with gain or clean, and work well in many woods for many genres. Many C5 owners jumped ship and went with C8's when A8's become more widely available a few years ago.
UO C5's (C5 with a UOA5) are slightly warmer than a C8, a little less output, and have much more A2-type dynamics. That means a more complex, dynamic, earthy, organic sound. If you want a 'PAF on Steroids' this is the way to go.