I recently purchased the AC15HWX and dig it to the max. I have an AC30C2 and also an AC30C1. I have a few pedal boards and probably 20 or so pedals....maybe more. All these amps have there strong points, but as far as pedals that work with me:
Marshall Blues Breaker II -- Killer Marshallesque sounds, dialing it down smooth overdrive
OCD -- can't go wrong with this, however watch the tone settings, 10'clock is what I use otherwise to trebly.
Lastly, I saw a pic of an AC on an amp stand. Take that sucker off!!! It kills your bass and lower mids. Trust me on this. Or better yet, try it on the ground and then on the stand and ask someone to tell you their opinion. Wayyyyyyy to much highs and you lose all your bottom end. To me, if you want good tone, don't elevate the combo amps more than 12 or so inches. All of above is totally subjective of course......... : )