Some suggestions...
* You would like a set of speakers that's easily bi-amped:
Alpine Type-R (SPR-60C). With the ability to time-align tweeter and woofers from either side independently from each other, the imaging should be much better than what you can get from a typical passive set with all speakers in typical stock locations. Infinite adjustability of relative driver amplitudes.
* You would like a set of speakers that work well with limited amplifier power (50-80watts, or perhaps just head unit amp)
Morel Maximo
* You have lots of power (at least 100watts RMS per side):
Massive Audio CK6V