Good Golly, I think a lifetime could be spent exploring all the terriffic English (or if you prefer, latakia based) blends and there would still be some you missed.
Aside from the blends already mentioned, I'd suggest some Pipe Works & Wilke #400, 10, 78, 524 and 622. These pretty much run the strength/subtlety gamut, and are fine tobaccos.
The Ashton blends that McClelland reintroduced (Old Dog, etc.) are flat out great, and we are lucky to have them back.
GLP Odyssey, Lagonda and the aforementioned Westimster are rock solid, Hermit Tobaccos Ten Russians and Stimulus Package are crazy good as well.
JF Germain Special Latakia Flake is wonderful, but tough to get right now.
Okay, I'll stop now. Sorry to run on, but the possibilities are almost endless.