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I bought upper-level speakers based on size (fitment) and price (not too cheap). Premium speakers are $400 a pair and there is a big drop in price to the next level at <$180 per pair. The front speakers are component type (separate tweeter): JL Audio C2650, $160 approx The rear speakers are 2-way: Alpine SPR-60, $110 approx Both are 6 1/2" size. Here is my post. Any speaker is better than stock. The head unit (for 4 speaker systems) is made by Sony and can output about 20W/channel max. so you will get 15 W of good sound. Don't buy high power speakers that need more power to drive them.

You can cut all the speaker wires at the head unit, go to an amp, then back to the original wiring. Power the amp with separate power from the fuse block in the back if you only need 20 or 30 amps. Turn it on from an ACC circuit in the same fuse block. See my post on connecting directly to this fuse block (AJB). Or buy an amp that senses the speaker signals and turns on. It gets complicated if you buy separates with external crossovers. You have to run new wire to the tweeters. If you can't find the previous post I can post the speaker wiring diagram. Let me know. The stock speakers are crap and must be replaced if you want more sound. I found just replacing the speakers made a huge difference. I am waiting for a new amp with built in digital signal processing I preordered months ago. I ran the last wire today (amp power). I'll post the cool way I found to connect to the battery.