Hey Max (and whoever else knows more about speakers than me)
What do you think of these:
Polk Audio db651s 6-1/2" 2-way shallow-mount car speakers at Crutchfield.com
How do they compare with the Infinities that you posted?
I'm also considering this set of components (but they're twice as much money)
Polk Audio db6501 6-1/2" component speaker system at Crutchfield.com