Topiary Moogle as well as the ilvl 205 or whatever gear you can get from the Wolf's Den are also good items to desynth. Random furniture (generally outdoor pieces) should allow you to level up CRP for very cheap.

My issue with desynth is that it's kind of a dead skill now. It doesn't really improve your chances of getting something good from desynth enough to warrant the time it takes to level it up. I have some of mine pretty high up there but even if I'm above the recommended desynth level I feel like my chances of getting stuff (e.g., from desynthing the weapons from the SB EX fights) is about the same as it was previously.