PureMusic and Audirvana are a couple of suggestions. PureMusic interfaces with iTunes and Aurivana is a stand alone product. Both are terrific but suit different tastes.
Fidelia -detail and dynamics, get the full version $79 Amarra - just feels good, too pricey Decibel and Audirvana are tied. Pure Music- this may rank much higher, honestly it has been awhile on this one. Bit perfect is in the middle somewhere- I haven't spent a lot of time with the newer versions.
I use Fidelia, but the cheaper version, ($20). Works fine with a lovely interface. It just uses iTunes as your library but plays and converts if needed without any hiccups.
I also use BitPerfect. Even cheaper, ($5). But you retain the iTunes interface. The only issue with BitPerfect is that it's not Airplay compatible.
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