Now that you mention it, perhaps I should take a trip to India... hmm...

Seriously though, the best Celtic ships are those of the Veneti, IIRC. They're "ok" - not extraordinary, but they're fine. The worst thing about them is not their stats, but rather that they're only available from the one province in north western Gaul, which makes them logistical nightmares to use in the Mediterranean. As to how it'll go in this AAR, well... he who lives will see, aye?