Re speakers I would be looking at JL, Raindow and DLS:
http://www.caraudiodirect.co.uk/audio-evolution-vr650csi-p-7297.html
http://www.caraudiodirect.co.uk/dls-c6a-p-5803.html
http://www.caraudiodirect.co.uk/rainbow-slx265-deluxe-p-3852.html
I would recommend the JLs (having a set of the Evolution C5-650s) but really any of those would be good.
As far as fitting goes, if you feel happy with taking your door cards off and working out a way of getting speaker cables into your doors then I think you will be fine. This can be tricky though! (had to take the doors off on my car!!). You might also want to fabricate a mounting ring out of MDF, so the drivers aren't mounted directly onto the metal.
Aren't those speakers a bit overkill if you're not running an amp?