Amp:
http://www.caraudiodirect.co.uk/jbl-...a834cdc2221e41
Speakers:
http://www.caraudiodirect.co.uk/alpi...a834cdc2221e41
Which leaves plenty for a 8awg wiring kit. I'd also put £15 aside for some flashing tape, unless you're planning on using some decent deadening material at a later date...