Quickblade vid is a good one. Thanks.
I agree with DJ, go past you feet.... but I also agree that too far past your feet is bad. I think the longer paddles allow you to go further past the feet... (???)
I'm 6'0 flat (without shoes) or 183cm, and I use an 'un-cut' Naish Race Blade with the big 14'er Glide. Blade on the deck/ground I can get my fingers over the handle, but I can't get my palm over the handle (reference for other paddlers - but if I was 6'6 I would want a longer shaft!).
The paddle dimensions are about 7'4 or 88" long overall. 9"5/8 wide, but new paddle page lists as 9"1/2 (who cares!!

) Maths suggests that is 16" above my head, less the big water line for that board !! Stroke rate is slow.... but cruisey

.... the way I like it

http://www.naishsurfing.com/en/paddles/index.htmlThis new page lists a range of new Naish Paddles.
I initially thought this paddle was a touch long, but you grow into it, with a big volume long cruiser board. The board is about 5"1/4 thick, but the massive volume has you sitting high. Feet probably 2"1/2 above water line (???) At least 2"+.
Motto of the story... I guess... "don't rush into cutting too much of the stick".... no puns please

.... and if you do cut too much off, a 20mm dowel piece might make the perfect insert .... have a play... seriously, no puns intended