I'm thinking of getting a directional board for waveriding and also to use for cruising on flat water on light wind days. Will be riding with straps
I'm not sure what size to get either. I'm 80kg my skill level is at the bottom end of intermediate on a twin-tip (I can slide turn and get upwind consistently)
A mate has recommended a Slingshot Celeritas 5'8" but I would like to get some other opinions too.
Just go with the Slingshot Celeritas 5'8 for your 80kg
The 5'11 is a bit too big/wide for your purpose - but they are great boards.
Go with the 5'8 as otherwise you will start THINKING about what the difference is etc etc - and it is a waste of time, believe me.
You CAN NOT know which board is right for you, till after some years.
And the one you are looking at, is great and allround - so instead of wasting time, get one in a hurry and get out on the water
You will see so many who either pimp their own board or brand, or give true good advice regarding what they use - but no matter what, you wont get any "wiser" by reading any of this.
IMO: Get the 5'8 and start having fun
PS: I am actually riding with brands which are a competitor to Slingshot, so I have no interest in recommending this - on the contrary...
But my mates ride different brands, sponsored too but what the heck, so I know most boards and can vouch for these