[Cheve]

I went Infinity all the way around. 5 1/4's in the front door, 4x6's in the back door. 12inch Infinity sub in custom box under back seat. Cheapo Wallie world amp for the sub (will be replaced soon with an Infinity amp) and a Kenwood head unit.

I recommend sticking with the Infinity since you already have two in. Or get 4 new speakers with whoever you decide to go with.

Also remember that a good head unit drastically improves the sound your speakers push.