High Current Outlet for Amps?

This is going to depend on the efficiency of the speakers, SPL, and what operation class the amp uses.

One thing is clear tho -- a dedicated line is close to the last thing you want to do to improve SQ.  if you are doing a remodel anyway, then just go ahead - get bids for the different options first.

I had a 30 amp line put in for my system and use a PS Audio Premier Power Port for the receptacle.

As Dave said above, the cost difference between the 20 and 30 amp circuit is minimal.

Well, my concern is not cost because the current remodel requires new circuit and cable anyway so it's just something quick for the electrician and cost me next to nothing. Now, the 30amp outlet plug is different shape than the ordinary 20amp? 

As for not going through power conditioner, let's put aside sound quality but safety? Some amps draw so much power that condition may actually do more harm than good to the amp? Is this accurate?

@gr8av4life  

The 20 amp receptacle is the same as the 30 amp one!  No difference at all.  You are just running 10 gauge wire connected to a 30 amp breaker in the service versus a 12 gauge wire connected to a 20 amp breaker.

All of my system components are connected to a PS Audio Premier Power Plant regenerator except my power amp which is conditioned by a PS Audio Duet and Humbuster III.  Works great for me. YMMV.

Agree with steakster about putting in more than one line, especially if everything is going to be plugged directly into the wall receptacle.