It's probably been done to death this question but I could find a suitable answer when searching. So far I've sorted out:
Front & Rear Speakers with the MDF collars.
Ordered an Stealth sub off Andy.
Looking at a Alpine CDE-130R ( Home AV Direct: LCD TVs | Plasma TVs | Blue Ray & DVD Players | DAB radios and more ) for the HU, is this powerful enough to run the front speakers?
Looking at the Kenwood KAC-6405 4 channel amp, ( Kenwood KAC-6405 4 Channel bridgable power amplifier 4/3/2 channel configuration - KAC-6405 from Kenwood ) is this ample to power the sub and rears?
Plus the adaptors for the HU.
Anything extra I'll need, gonna be helping a mate fit them for me, as my knowledge is of car electrics is poor. Is there a better brand of HU or amp to consider for similar prices?