Opinions Wanted

[LivinLoudX54.4]

So here is what I'm thinking about, and your opinions would be greatly appreciated.

I currently have the 4:3 Nav in my X. It has the original nav disc that was issued when the car, so needless to say it is very out of date.

I also have a portable GPS, Tom Tom to be exact. I really don't want to shell out over $100 for a new disc.

I have a very good pioneer head unit that I had in my E46 sedan, the sound quality out of this unit is amazing. Now onto my question. I'm thinking about swapping out the Nav unit for my other radio.

The plusses that I get out of the swap, direct connection for my sirius and iPod with out spending $150 on the DICE which I had in my E46 and I honestly wasn't that impressed with the unit it self.

So what do you think. Any one have questions of the single DIN adapter plate in a double DIN dash?