I'd be inclined to move quickly on the N7 and J27, both still available retail under the hundred quid mark. Can't see that price lasting much longer under Hornby's ownership...
My own rather less ambitious list looks like being dominated by rollng stock in the near future, Heljan's Newton Chambers car carriers leading the charge, a very KX-centric release while carrying BR maroon. Then there's Hornby's Coronation vehicles, Accurascale's BR mk1 57' all compartment stock, and I might spring for a Rapido LMS D1666 general merchandise open in the hope that encourages them to 'move forward in time' to the final LMS/BR type with the part steel ends