Pioneer or PowerAcoustik - Car Music

Hi QLers,

In an attemp to upgrade the music system in my car (Honda Accord 2009), i found myself confused, so I am discussing this topic, hope someone can help. I found Multimedia Navigation System which fits this car, the brand name of this product is PowerAcoustik

You can view item here

Why i am interested in this as It has many features and made for Accord.

As I dont know what kind of company is PowerAcoustik, I am writing this forum and asking you.

I know the reputation of Pioneer, Kenwood etc. But PowerAcoustik i heard for first time and i want to know your impression of this company.

This product is not available in Doha, but its on Amazon. It has many features. But i dont want to compromise on sound clarity/quality, which is my first preference.

Other option from the availability in Doha is Pioneer - AVH-X5550BT.

You can view item here

Which one i should go for...

My preference is...

1. Great music clearity/quality source.
2. To be able to connect to my iPhone 5.(Pioneer doesnt have this yet for iPhone 5)
3. Navigation system (Pioneer doesnt have this)

I plan to change all speakers from Pioneer, is this choice correct, kindly suggest.

Thanks in advance,
And even if you are not replying, thanks for reading.