Wiring Help

Hey me again bugging the hell out of you genius . Ive got a mk1 punto 60 5dr with 8.7cm speakers in the front one of which as blown. It also as 10cm in the back 2 pillars. I wondering if anyone has any experience in wiring one of these cars up.
I want to use this HU http://www.halfords.com/webapp/wcs/s...egoryrn_129484
or some thing similar.
I would like to have 6 speakers in total with a sub in the boot. The speakers i would like to be same places as stock and also some 6x9s in the parcel shelf or at least thats my idea. I cant put speakers in the doors as they are not electric windows. Also i cant put bigger speakers in stock places as they will not fit especailly the front speakers as they are a tight fit to start with. My budget is about £600 which i know is alot but gives some leeway with components. I would be grateful if someone could give me a list of specs for speakers amps and sub so i know what to look for and what to get. Also if someone could tell me how to wiring what to what etc.

Sorry for the essay. If anyone could help i would be sooo gratefull its my first car so i want to make a good job of it.

Thanks People
Macca