If you don't want the hassle of hooking it up to the hacked Logitech wheel, definitely go with the ipac.
Some emulators and a lot of older PC games won't allow you to use multiple controllers, but they will allow you to use both a controller and a keyboard.
An ipac4 is kinda overkill, but if you already have it you might as well use it. You'll be able to add as many buttons as you'd ever want in a driving cab.

I've posted it many times before, but just in case you missed it......
I really like having a start button that posts as Enter, an exit button that posts as ESC, and other buttons that post as the arrows on the keyboard.
(I put arrows on my view buttons and use them).
It makes navigating PC games and the front end really easy.
I had one old PC game (the original 2005 need for speed underground) that required you to press Q to quit, so my radio button posts as that.