Good points Cam,
The reason I am even considering the 473, which I think is bigger than we need, is that then I am definetely done size wise, won't ever have to get a bigger boat. If I get the 423 I might just wake up in a few years time with threefootitis. Still leaning towards the 423 though... wife thinks it is more sensible.
std tankage:
423: water 154G
Fuel 53G
473: water 220G
Fuel 56G ( I think that there is an option of one additonal tank for a total of >100G)
I am guessing that the 75hp Yanmar in the 473 will consume a bit more fuel than the 56 HP in the 423 so the standard fuel tankage in the 423 probably gives a longer range?
Cam, I believe that you have been down the ICW a few times, is 5'7" draft really a big problem?