Depends what you want mate?
pure power or a mix with handling?
I'd go for a revo map, as that can be developed to a stage 2 + map eventually that will show you a good 350hp. (for that you will need fuel pump and intercooler though).
all the usual mods apply. Exhaust, induction kit etc.
Handling wise, definately needs lowering

Just springs if you dont want to spend too much.
Exciting times ahead if you go for the Cupra
I recommend the normal cupra over the
K1