You dont say whether the car is a factory manual or auto, estate or saloon . Its makes a difference. The manual estate being much more desirable & thus expensive.
There's nothing there that looks too scary - offer 2k and budget 2k for immediate stage zero, pcv & new turbo CHRA an TCV plus other odds and sods. That'll get you a car in good running fettle which is going to be worth at least the money & time you've sunk into it.
After that you can spend as much or as little as your buget allows - but an R will need to have at least a grand thrown at it every year (conservatively) if its driven regularly to keep on top of gemeral ware & tear, with a bit of proactive maintenance too. If something major goes wrong then you face a repair bill of a couple of grand tops (eg engine rebuild, replacement gearbox, full suspension rebuild all around etc..) but thats it. The R is a standard 850 T5 in a dress. Parts are easy to find & inexpensive. Just keep ontop of the jobs & it'll keep ahead of you in appreciation & be a pleaseure to own & more importantly drive
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If you don't want it let me know. I'll buy it & restore it. Always after an R project - but only if its a manual & ideally an estate! - and for sensible money.
Cheers, Morgan