yeah, amp the front's, you'll be amazed, i fooking hate the sound of cars with amped rears and nothing up front.
The mounting of the speakers will make all the difference in the world too.
You could have the best speakers in the world, but if they where badly installed they'd sound shit.
Try and get a nice pod mad for them, if thats not doable, make sure they are mounted really well, a wooden baffle (3/4" MDF is good) works wonders.