Yeh that Crazy number looks for lakes only. Too extreme outline (and probably rocker too) for ocean IMO.
BTW - my LF is a 151 Proof (not Drop - but very similar to the ol' drop series).
Good tip on looking at beginner boards. My LF Proof is from that ilk and goes awright for LW, at 80kgs the 151 would be a great economoical option for you (but you can't have I love it

).
There are more specific LW options
for ocean/surf tho. Plenty of choices out there for LW boards. LF, Cardboard, Airush etc.
The good thing I like about my proof is, although a compomise on a true LW board it can
easily handle when the wind picks up, (can't be said of all LW boards) goes
really nicely on waves/chop and is tuff as all fek! Heavy board but hey - you can't have everything.