Go with the W6v2, I have owned both and still own and IDQ and the W6 takes the cake. The 500/5 is a great amp for going active with its staggered front and rear channels. Ive said it before, some of the best components for the money are Pioneers TS-C720prs. The frequency respnse graph is as smooth as sets that cost about 5 times as much. Spending big money isn't neccesary if the install is on point. Big audio keeps reccomending an IDQ like he owned, even though he claimed in his for sale thread he never used it, weird.
Make sure you deaden your doors with a dynamat or second skin mass loaded deadener and then use an acoustic foam over that. Spend the money and Install correctly the first time.
TS-C720PRS - Pioneer Premier 6.75" Component Speaker System