Now I've been doing as much research as I can in my time off but am starting to feel like my head's about to explode from the info I'm trying to absorb!
So I need the help of the gurus around these parts to try and straighten things out a bit.

I've got a limited budget for this project so don't want to start spending money willy-nilly on mods that may lead in the wrong direction.
What I'm after is the best way to improve the responsiveness of this little beasty in the lower rev range.
Strangely enough, even in stock form, I'm quite happy when things get over 5000rpm but that's not where I spend most of the time, just want to cruise the country roads with the occasional blast for a bit of fun.
So what mods would I do to best achieve this?
Not after much of a gain in peak power, just want it to start earlier in the rev range and last longer.
From most of the dyno graphs I've seen most of the improvements seem to occur above ~4000rpm after modification.
Is it simply a matter of getting the turbo doing it's thing sooner, at lower rpm?
What bits do I need to replace on the standard car to achieve my goals?
I know a supercharger would probably achieve this but that's an awful lot of $$ and work!
Thanks in adavnce for your suggestions guys!