I would say schumy, the back up is fantastic and the S1 is only £130 now.
upgrades, not really many unless you want to.
I have a CF pro and i feel the carbon is not needed, the S1 is fine.
and with it being british, there are spares everywhere and sooooo glad i stayed with schumacher.....
I say go S1 cougar...........
Or, the X2c, that would be my 2nd choice, as mentioned, spares are cheap and good from the box to.....
have a look at your local club and go from there is the advice i was given and took, but i swayed the schumy way as was into them 22 years ago.
Must say the support from schumacher is 2nd to none and never had any issues finding spares.........