Help! New Cat owner

[Alex H]

Hi guys!
Because the introduction of the Cougar SV, the Cat has earned a lot of interest as well up here in the cold lands. I only know about one in the country and I haven't seen that one in real life so I know nothing.

Have both cars on order and want to learn some useful things from you who have got the experience.

Options? what should I invest in? Our track are very similar to yours. Used football turf. Dirt tracks as well. One way perhaps? What spring rates do you mostly use?

Spares? What is useful to have in the spares box?

What is the smartest thing to do. Have got a nice price deal on a SX. Upgrade later to a SX2 or buy the SX2 directly? Honestly, I want the SX2 right away.
What is up with the upgraded chassis for the SX. Stiffer? Is that one included if I buy a new-in-box SX today?

Tips and tricks? Anything you think I should do the first thing with my brand new ride. As I said, dont have a clue since the cars are brand new for most of us up here.

Thanks in advance.
//Alex