Boston NX97s & metra 82-4000
The Boston NX97s will fit with the metra adapters without touching anything. You have to get over the size of the magnets though - they're tiny! They put out the bass much better than my bro's Infinity components (he concurs) which we couldn't believe. Top end is excellent, as it is with all Bostons.
I'm running a Coustic 481qe (clean 60wx4) to the 97s in the back and the 57s in the door, crossed over at around 200 in the front, full range in the rear. The 97s are 92dB efficient, so I've had to back the gain down to match the 90dB of the 57s in the doors. Almost perfect, just need to find the buzz in my drivers door.
Now if I could only find a head unit to mount in the trunk with a remote display, the invisible install would be complete!