I am doing a complete reinstall after a full crash. I have VFR Photohtaphic Scenery 1, 2, 3 and 4, FS Terrain, VFR Terrain England and Wales, Streets USA, Megascenery USA2004 (California Nort and South). I understand that there is a FS Global Terrain and now Just Flights USA Terrain.
Should I install my own Terrain software in a certain sequence or does that not make any difference?
How do the others (FS Global and USA Terrain) fit in? Are they complimentary or really mostly the same?

Thanks

Theo