Very exciting times Des. The container flats are really a must for any layout as they were pretty much all over the network. The Ammonias and Barrier wagons are also very iconic. I remember spending a few hours in Bray watching Ammonia trains being hauled by 201's and some bagged cement trains for Wexford, and 071 hauled MK11's for Rosslare.
Actually if you look at what is available now with Eoins Darts, MM locos and coaches, your own forthcoming wagons and other delights, D&M bagged cement wagons, Bray would make a nice layout.
I think you should consider the timber flats Des, could you imagine how amazing they would look. They could be your Sgt Pepper's or Dark side of the moon.
Rich,