in my opinion, Infinity Reference speakers are the best bang for the buck and the 3.5" specifically are about the best ones around for a decent price. then add a 5-1/4", 6.5", or set of 5x8/6x9s for the rear channel. all of these will sound ok if your deck is putting out near decent power (at or close to 20W per channel).
if you really want to have the ability to have a well-balanced system, do it right and use a set of component speakers up front and power them w/ an amp. you can put the mid-range woofer in the door and put the tweets in the dash corners. run your rear set off of the amp also.
you can get decent 4-channel amps from just about anywhere (walmart, for ex.) that will do the job and not break the bank. with the 3 pre-amp outputs from your head unit, that means you likely have independent tuning of the front, rear, and sub channels right from the deck. this lets you easily set cross-over points and levels without having to go to the amp with a screw-driver.
i suggest you spend a few bucks on a 4-channel amp (50Wx4 or better) and decent speakers (i suggest Infinity Reference, often on sale at Crutchfield); the resulting sound will be worth it.
run 4-ga to your sub amp and at least 12-ga speaker wire. you'll only need about 10-ga power wire to the 4-channel. here's a tip; if you buy a capacitor (1F, for ex) and tie it into your sub amp power wiring near the amp, you then have a very neat and accessible location to tap into for power to the 4-ch amp. just ensure your main power wire fuse is rated for both amp loads.
these suggestions will take you over your budget, but the appreciation and enjoyment you get from being able to play and enjoy music at higher volumes with rich, full sound is so much better than just being able to make bass.
lastly, if you haven't already figured it out, follow the wiring diagram for the head unit and it will explain exactly how you need to wire it: constant 12V, keyed 12V, illumination, ground, remote turn-on (for amps), speaker wires, etc. basic vehicle wiring skills and patience/attention are all that is needed for car audio install.
edit: oh, and a tip that you might already be aware of: keep your signal and power wires run as seperate as possible to avoid noise. an easy method is to run your RCA cables from your head unit to your amp down one side of the vehicle and the power and remote turn-on wiring down the other.
