Nubie!: general Questions

[perlScripter]

Forum onlookers,
i am but a nubie to car audio but have a decect technology understanding. I have just bought a system for my '00 jeep cherokee and i need some infomation.

• the system consists of:

1. Pioneer DEH-P3900MP Deck
2. 4 X Infinity Reference series 5022i speakers

I know it doesent sound like much, but it is a start.

My question:
I am try to go for a Very well ballanced and artulcate system that boasts the full range of high quality sound (Low, Mid, High) at high volume levels. if i keep the deck i currently own, what suggestions can the forum committee on speakers that fit my wants?