Thanks very much mate!
I like the 2x10 on the S4 (vs the 3x9 on the FX 3).
I also like the frame and components make it 2kg lighter.
I also like the cables are hidden inside the frame (which FX 3 doesn't have)
I read a few reviews and people have said the S4 is really, really responsive, nippy and a fun, fast ride.
Sounds like I'm making my mind up
Now to decide which tire as I want something that handles gravel a bit better than the stock standard ones (yet still fast on the road). The three I am looking at are:
Schwalbe G-One Speed (700x35)
Schwalbe G-One AllRound (700x35)
Panaracer GravelKing SK (700x35)
Wouldn't mind getting the tire with a brown sidewall too which I think will compliment the metallic frame nicely. Thoughts on tires?