Make sure it has had the cambelt changed recently. The cup splitter and spoiler, they transform the asthettics of the car (in my opinion), if you're changing the exhaust system a remap makes a big difference, I went to rs tuning, they did a great job.
Recaros look the part and feel great but are fragile if you want or already have them as the bolsters wear quick.
And keep a few quid aside as now and again these cars can be expensive.
Most of what I have done I've tried to keep it looking like what renault would have done
But they are great fun and if your not used to a car with this performance, get used to it first. I moved up from a 106 and it was a big difference.