I picked up a copy of Action Stations! from A and A Games today and the rules look good from my first read through. The main attraction to me for these rules is that they cover aircraft, boats, submarines and shore defences all on the table at the same time.
I'm still undecided if I'll got 1/600 for the sea craft or if I'll go down to 1/1200 or 1/2400. I think I'll play a few bigger games of Bag the Hun and see how a 6x4 table feels with that before I make any big decisions. Besides I still have more than a few 1/600 aircraft to paint.