Very nice! As for leave it or return it to standard- do option 3 and tune the shit out of it! No only joking, up to you, ultimately if you want it to hold the best possible value standard would be the way to go, but tuned examples can drive better, be quicker etc etc. So its your call.

thats usually my first plan with any car i get!
Im stuck between a rock and a hard place, I know I will sell in the next 5-10 years so im thinking maybe leave the injectors/decat as it is and maybe just get a fresh map loaded after a good service/cam belt change.
Its a hard one, so tempted to do the usual suspension changes etc as i dont want it just sitting in the garage it needs to be drove