To sum it up:
FZS 1000 - Sports tourer, with the emphasis split between the two. It's big and comfortable, is very practical with decent mpg, can be made to handle pretty well with suspension upgrades, and can have an already strong engine made even stronger with an Ivan's kit.
FZ1 - Sports tourer, with the emphasis put more firmly on sports. It's better handling as stock, and has a revvier engine with a bit more poke. However, it's got a smaller tank, uses more petrol, and is defininitely less comfortable as standard.
All depends what you want really, but if you want to go touring I'd probably go with the FZS 1000, it's more comfortable and has a better tank range!