Most of today's head units that are double din will have the stuff you are looking for. If you do not want to add amps and subs that is fine. Only you will get better sound out of your new speakers with a new amp. The always great head unit choice is the kenwood 6140 and also look at alpine's you might spend a little more but I think they are worth it. Still kenwood gives them a run for their money.
New component speakers that will run good off the stock head unit. Would be something like the polk db's or the Memphis equivalent.
15-PRCS6 - Memphis Power Reference 6.5" Component Speaker
Either way you are going to get even better sound and more bass out of any speaker with a external amp.
Also welcome to the forum!