Best sort of speakers for the clio, IMO, is the Focal Access speakers, sound great just off the head unit, when amp'd sound one hell of alot louder and bass'ier.
Im currently in the process of upgrading the rear speakers to the 6.5" and will be doing the fronts also with an MDF baffle ring. If you get a new'ish headunit, you can set the filters up and gain a little more bass that way aswell.
Also on the note of InPhase equipment, the amps they do are very good, the whole range of speakers are not. If you can, get the DB Audio speakers.
DB Audio and InPhase are basically the same company, DB Audio is more on the american side of build quality and size tho where IPA is made in the UK, in Nottingham so i am told.