There's fcuk all wrong with the STD seats.
If you want to spend £850 so the next registered keeper has nicer seats that's up to you
.
As for the Cup chassis - again the STD 200 is like a go cart - I reckon the cup chassis will shake you up too much - Guess it depends on the roads you're on but the b-roads up here can shake you up big style.
The wife commented last night on how comfy the STD seats are and how harsh the ride was (oooh err).
2 track days per year versus the rest of the year driving "normally".
As for adding 850 to a car that costs 15k - You can get a bog standard 200 for 13,800 - You'll end up spending 15,500 (maybe more) - it's all totting up !!
ps You were asking about getting the Stereo upgraded to include to Bluetooth - I'd be wary of that as the std stereo aint loud enough (says 4x20 watts - hmm must be quiet watts!)
Anyway - just sharing my views - choice id obviously down to you - good news it's coming sooner