Opinioins on Set Up

[vipergtx500]

Hey guys im looking to upgrade the audio in my car and i've come up with a few options. I'm kinda new to the car audio field so im looking for some advice. I have a Sony CDX-GT310 HU already. I've been doing some research and see that it's better to get the component set up because that's what comes stock and going with just a coxial in the front would be a step down. I also heard though that a 3-way or 4-way coaxial would be good, i'm a little confused about that but this is what i've found so far.

These for the front Alpine SPR-17S (http://www.crutchfield.com/S-19ssuM83elJ/p_500SPR17S/Alpine-SPR-17S.html)
These for the rear SPR-69C (http://www.alpine-usa.com/US-en/products/product.php?model=SPR-69C) I think the size is 6x9 if anyone can correct me please do. I don't think i have the monsoon set up, I have only 1 speaker on each side in the rear hatch, 1 sub in each sail, and 1 speaker/ 1 tweeter in the front on each door. I haven't decided on the sub replacement's yet but would like to stay in the Alpine family. I am not ordering these off Crutchfield I just used the links as references. Any input would be greatly appreciated. thank you

[V]

the speakers in the sail panels, those arent subs, i think if you have speakers in the hatch, you have the higher level amped system. and those rear speakers in the hatch arent 6x9s, just the cover are.

i think the proper sail panel size are 6.5

[vipergtx500]

interesting, then i'm guessing id need these SPR-17C (http://www.alpine-usa.com/US-en/products/product.php?model=SPR-17C). What would i get for the subs in the back then? and would i need to buy an amp for all of this?

[iroc86NJ]

The head unit you have is 17 watts RMS and the component Speakers you've chosen have an operating range of 8-110watts RMS With a Peak of 330.

If you go with those component speakers your either going to have to, step up your head unit to something a good bit more powerful, or you'll have to buy a 4 channel amp to run your speakers off of.

Not to mention a crossover and a 1 channel amp for the subs (if you put in a sub)

[vipergtx500]

Ok so I've done a little more research and he following is the list of the setup that I want on my car.

[Head Unit] Sony CDX-GT310 (http://reviews.cnet.com/in-dash-car-stereos/sony-cdx-gt310/4507-6729_7-32109559.html?tag=mncol;rnav) (Already on car)
[Fronts] Alpine Type-R SPR-17S (http://signature.crutchfield.com/s_500SPR17S/Alpine-SPR-17S.html?tp=27775) Components
[Sail Panels] Elemental Design e3.6 D4 (http://www.edesignaudio.com/product_info.php?cPath=1_21&products_id=33) subwoofer in each sail
[Rear Hatch] Stock for now
[Amp] Some 4-channel, need help here not sure which one I need, trying to spend around $100

Any opinions or advice would be greatly appreciated. I'm not sure on which Amp at which power rating would be best. Thanx