I had the speakers in the centre console, unfortunately it was in my convertible so the road / wind noise made it dificult to give a good description of the sound quality. Although when stationary they sounded pretty good, I used a pair of Pioneer speakers, can't remember the model no.
The only other problem is that you need to hack big holes in the sides of the console to fit, but I think decent centre consoles are easier to find than decent door cards !
Another trick I should mention, I did a fairly serious install in a Midget once, 600w amp welded to the underside of the dash on the passenger side (needed special alternator), 18" and 10" drivers and tweeters in a custom panel behind the seats etc..
As good as it was, it lost a certain amount of detail once moving with the roof down. So I installed 2 small tweaters in the dash, you wouldn't really notice them at first sight, but they worked a treat by "bringing the sound forward" without fitting anything in the doors.
I mention this because you may be able to fit the bass speakers under the dash/seats, and then fit tweaters higher up facing the occupants to give you the detail.