New Speakers

I have a 2005 Saturn Ion Sedan and I'm looking to get new speakers... I was thinking 5 1/4 to 6" alpine type Rs, but I wanted other suggestions.Currently I have:Alpine 1913 DeckAlpine 12" Type X and an alpine MRD-1005 amp (i think thats what its called)

any suggestions on speakers??? 5 1/4 to 6"

any comments???