Best double din radio? Options

[cjpost]

I am looking to upgrade my stereo system and I plan on buying a double din touch screen head unit as well as two new sets of speakers (front and back).

Subwoofer capability is necessary, and I would like it to be relatively loud.

I have the 1994 gt coupe with no 8 speaker option.

I have been looking around and it seems like none of these radios are compatible with the iphone 5s without a separate cable.

At the moment the kenwood ddx470 seems like the best option with my budget (I would rather not spend more than $350 if possible

Any advice on what speakers to buy is also greatly appreciated, I can spend up to $200 for the set of four and am looking for good sound quality as well as loudness.
I need speakers that will not blow out if I am blasting the music.

Also, I have been looking around and the highest I have seen is a 22W preamp output for the speakers. does this mean I should invest in an amp as well?
I am not sure as I previously had a 99 vert with the 8 speaker set up and a single din head unit.

Any suggestions are welcome and appreciated, thank you.