Ok.. done just bought a vp180 will post a pic when recieved & installed.. so whats next?

should I change the sub or amp

currently have the KSW15 & avr4802

change amp to a 3d avr (anthem mrx 700??)
and for the sub 2 x ep500 or 1 ep600?

7.1.4 * MRX1120 * M100s * 180HP * 4x M3-on walls * 4x M3-IC * dual XV15se * Shakers