Infinity speakers are only good at low volumes, if you like me have times when you wanna play your tunes at loud volumes, these speakers are crap. Trust me don't listen to people who recommend these speakers.
If I were you I'd go for Alpine type Rs or Type Ss, I soon be running to sets of these in each door build (currently in the process of making).
Now these speakers sound so wicked, the detail is out of the world for the money. They play excellent at low or high volumes. I would never use anything else. The only speakers better then these are the Alpine Type Xs, but at £240 their abit pricey.
Others speakers I rate are: Kenwood (give better mid than the alpines, but less tops), Pionner (abit to bassy for my liking), JL audio, Phoenix Gold, Rockfords (very similar sound to the alpines, pricey tho).
Hope this helps