Well whats the most you'd want to spend?
With the info provided I'd say a Vifa 1" soft dome, 4" Dayton midrange, and 8" Dayton midbass per side.
Parts-express.com is a good place to look at raw drivers.
You either need an active deck like the Pioneer 80prs or you need active amps, like the PPI P900.4, in which case you need 2. You could also use a nice 6 channel.
If you provide more info, more people can help.