Re: Speaker set-up for my Saab?
Ok, let me take a stab at this.
1. Coaxial unamped - First off, if your going to be going coaxial all around, you need to realize where the sound will be coming from. Since the Coaxial speaker is the speaker that would sit where your midbass driver would be on a component set, you need to realize that if your current midbass driver is at your feet, then the coaxial is going to play music at the floor, and not at a good listening height. Subaru's have this issue, all the speakers are at the feet in the doors.
To stay under the budget for all coaxials, you would want to go with a baseline coaxial. For example, Alpines floor speaker coaxial is the Type-S. Polk it is DB-series, etc... These usually run between 25 watts RMS to 60 watts RMS. Since you'll be going unamped, anything over 20 RMS (nominal) watts will be fine.
Coaxials Amped - Is not worth it IMO. Once again, you'll probably be firing at your feet, which is bad for listening, and muffles the soundstage. Also, you'll probably go over budget a tad because you'll be looking into higher RMS rated speakers, such as the Alpine Type-R.
Components Amped - This is a great route for you, basically because the stock locations are already made for you. Also, components are a great idea for any car audio, even replacing an already factory component set.
Your best route for your budget is to find a desired component set withing your budget, and then find a good 2 channel that either matches the rated RMS handling of your speakers, or undershoots it by a tiny bit. If your good with car audio, you can overshoot for more tuning.
As far as purchasing for this set, just buy the front components, a 2-channel speaker amp, and the maybe a cheap set of coaxials for the rear.
To save money, do not amp the rear coaxials. Let the run off of the stock wiring from the wiring harness behind your head unit. Later on, if you want more OOMPH from your system, you can find a set of midbass drivers and plop them in there and amp them.
You can find a good set of components for roughly 125-175$ to suit your needs (online store such as Millionbuy.com, SOnicelectronix.com, etc...) and a cheap amp such as Power Acoustik, which is reviewed as a great amp for its' extremely cheap price, for roughly 100$ or a tiny bit more.
As far as fitments, go find a Saab forum.
2006 Subaru Impreza 2.5i
System Currently:Speaker Amp|Phoenix Gold Xenon 100.2 Sub Amp| Phoenix Gold Xenon 600.1 Deck| Pioneer DEH6800MP Frontstage| Alpine SPR-17LS "]Sub| Phoenix Gold Xenon 10"
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Refs from sellers: Dre2390