S2k007

Just a few questions on the head unit in question.

1. From all the reviews I've read it seems like a great unit, packed with features, with the downside being the not very friendly user interface. Can anyone recommend or shed some more light on this unit?

2. Do I need an additional wiring harness from crutchfield for the install? I understand its free from crutchfield but I intend to buy it off Amazon since its a good deal cheaper. I'm going to get it installed professionally since I'm not good at these things.

3. As far as speakers go, I have a 2000 S2k, would coaxial speakers my best affordable bet here? If so, what would be the recommendations? I'm not looking for anything high end, just good bang for the buck stuff.
How are these, or these? Will the depth of this speakers be an issue when installing without modification?

Thanks in advance.

S2k007

Anybody?