TBH I'd do the belt too, but can someone please explain, are the 16V's chain or belts? I've read about both.
I'd do the rocker gasket and possibly the pump but obviously it all depends on budget... If you're on a tight budget is it worth waiting to see if things like the water pump go wrong or to do it now for safety of mind? If so is it worth taking it out and putting on a new gasket if it all looks groovy? They are a couple of quid from TPS.
Because you could go on and on, head gaskets, manifold gaskets, water pumps tensioners etc. but is it worth it/can you afford it?