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@Todd
Really depends on what you're using the bike for.
You can switch sizes of the sprocket easily enough to get a good gear ratio for the track.
I have the same cranks (165mm) and use a 46t with reinforced shoulder.
I've varied the sprocket between 14t and 17t.
Old campy 151 rings can be expensive. I wouldn't pay £70 though!
Campy oldy have a used 47t which is cheap. Don't know if it's 1/8 or 3/32 though.
I'd find a good priced ring from eBay and change the sprocket according to the gear ratio you want.
Seen a good range on the bay going for much better prices.
If you're gonna be skidding, best work out skid patches to get the most from your tyres depending on ring/sprocket sizes.
http://cgi.ebay.co.uk/Campagnolo-Record-pista-track-fixed-gear-chainring_W0QQitemZ280204848901QQihZ018QQcategoryZ56193QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
^^^Good size for track and use a 19t sprocket with it for road / skids ;-)