Crutchfield is your friend. Go there and grab a set of 5.25" speakers for the front dash. Crutchfield will include the speaker adapters and pigtail connectors for free.
Speaker pods - 5.25" are stock, but a few people have fit 6.5" speakers in there.
If you want a new head unit, crutchfield will sell you the head unit and throw in for free the install kits, which is the dash bezel, antenna extension and wire harness.
What is your budget and I will throw you some decent options. Depending on your budget Ipl see if I can squeeze an amplifier in there for you.