I was referring to height and traffic to accentuate the placement being outside the traffic area - I'm 6'6 and I hit my head enough w/o doing it in my happy place. The 8s have fantastic sound at a distance and can easily be heard over the engines while boarding. I always say go big or go home. If I didn't get such a great deal on the 8s ($100 new in box and not off the back of a truck), I would have gone with the 10s - for sure! These speakers will blow you and everyone on the lake away providing you throw enough clean power at them.
These are what dreams are made of LOL
If you're going with a WetWire setup, I got the 6 Conductor Wire (12 Gauge Speaker Wire w/22 Gauge RGB Wire) from ABT.com for $1.40ft = smoked everywhere else I looked, which is everywhere!
Keep an eye on the Wetsounds webstore (clearance/specials), Crutchfield, Yamaha Sports plaza (watch their shipping), ABT and Pacific stereo. It's hard to come by WS deals but they are out there.
EDIT: GET A SUB! The 650s have great lows but man...do it!
Feeling and hearing your favorite tune is a must