The 6500 series is one of the cleanist speakers that I have heard! Props to you for your choice!

As far as powering the speakers, definetly choose an amp that has a clean output, (alpine amps are known for their clean power). Also take into consideration that when a speaker is underpowered, the gains on the amp have to be tuned higher then normal to promote the accurate power that the speaker needs. this means, that the speaker will clip/distort more when played at higher volumes. with an amp that is around 100-110 watts rms will not clip when played at that same higher volume as before. if you choose the smaller amp, set the gains matched to your HU's output and play your speakers at a resonable volume without cliping the signal and all should be fine. *note: clipping and distorting a speaker, especially a tweeter will cause damage.

if I had your same setup, i would save alittle extra money and choose an amp adequate to the speakers ratings. remember your system is only as good as your weakest link.

just my two cents.

just my two cents.