I went with 20 amp breakers that fit my panel. That is your limitation you usally can't mix and match breakers with a panel. While you are at it ask for 10 gauge wire not the usual 12 gauge used for 20 amp circuits. That will certainly make a difference. Also have the ground run back to the panel you can do that by using non metallic boxes. That is very helpful if you are running more than one circuit/plug which is suggested. I ran three wish I had did four: 1 for the amp, 1 for the digital, 1 for analog. Hope this helps.
