I did some searching, and found 6.5" (front) and 5.25"(back) seem to be sizes people are using.

Im looking into getting Infinity Kappa component speakers, my question is this:

With the seperate tweater, can I afford the bigger depth? (being tweeter isnt on the actual speaker)

Also I need some suggestions.....Ive done the boom, I just want nice crisp accurate speakers (my dad has infinity, the sound is so clean) Do you think getting the Kappas as opposed to the Reference make any difference? I dont mind paying extra for quality.

Also, you think 200W mono amp is well enough to power these?