I'm in a similar dilema. My friend who has had 18's says be prepared to chip and damage the 18's, he is now using 17's and is happy, but I keep hearing from a lot of people I wish I had bought 18"

So I'm just as confused, I think I will end up going for the 18's anyway.

1999 Silver Frost Contour SVT 2690 of 2760 Born 08/13/1999 Sony Mobile ES CDX-C90 Deck 6 1/2 Infinity Kappa Perfect mid & tweet set, 2 12 Infinity Kappa Perfects JBL P.600.1 for Bass, P.180.2 for front stage.