I had CDT components in my last car run off of a JL Audio 5 channel amp, they were great sounding speakers.
Currently I am running a Pioneer AVH8400P head unit, with Focal K2 Power 165K2P-UV 6.5" components in the front. The I run CDT Audio M6 Mid-Bass/Sub-Bass Drivers for mid bass support. A 10" Morel Ultimo Sub in a custom enclosure rounds out my speaker selection. For amplification I went with a JL Audio MDH900/5. This system sounds great but costs a bundle.