i come from germany so please just ask if you don t know what i want to say

i am thinking about buying a surfboard soon and i don t really know which one to choose ..
but first of all here is some infromation about me:
i did surfing in nz for 2 months like twice a week .. mainly on 7.3 bics
i went surfing summer 2009 for two weeks in france on 7.3 bics and 6.8 nsp - towards the end of the trip i got quite used to the last one and it worked out quite good
i am 175cm which is about 5,7ft and 68kg which equals 150 lb
i do some skateboarding here
cause i am living in the middle of germany there isn t any beach close to where i live and i ll be only surfing one or tow weeks and maybe a weekend each year (probably in france and maybe the weekende in the north of germany)
i don t want to buy a 7f or higher cause they just not really handy and i'd like to go for a smaller one
which size would you suggest? is 6.4 still alright or better 6.6?
rather fish or shortboard? i ve heard that fish is better for smaller waves - is it possible to go for 2-3m waves with a fish too?
i actually considered that fish: http://www.newsurfproject.com/index.php?cccpage=fish64
i appreciate all hints and tipps =)
greetz
david