I am selling my beloved alloy 42 feet centerboarder in Australia. It seems to me it fits your needs : 350 L fuel, 700 L water, headroom OK.
However, as said in a previous post, you have to expand your budget even if it is very affordable for an alloy boat : 122000 AU$. But alloy has also many advantages over fiber...
if the moderator allow to let a web site link in this post for me, you will find more details on the boat and how to contact me here :
Via 42 for sale !
otherwise, contact me at michel.tissot (at) free.fr