Hello H-T!

I'm looking into buying an 08 TL-S. I'm big on aftermarket stereos.
From what I've seen so far, it looks like I'll be limited to the factory head unit. This really isn't that big of an issue as I know there are plenty of OEM integration units as far as dealing with installing aftermarket speakers and a sub. However, I'm unsure of what's available for integration with my iPod. Possibly integrating my HTC Evo if it's not too much of a hassle.

I'll also be adding all around aftermarket speakers with the addition of a sub. This I know how to do so that's not the issue.

What I'm aiming for:
I would like to integrate my iPod(for playing music and video on nav screen) and my HTC Evo(for integration into the factory stereo for making hands free phone calls) into the car while retaining all factory options(steering wheel controls, factory navi, etc.).

What units or devices are out there which will make this possible?