DM3 questions ?

So I am interested in a 13" laptop with great build quality.

After a little research, I found the DM4, which is BEAUTIFUL but 14", I almost got it, but now I see there are actually 13" laptops using the same build from HP.



Few problems:



1. All of those DM3's have 1.2ghz Dual core CPU's while the DM4 uses a proper I5. I don't get it ? Isn't 1.2ghz outdated ? Do they still sell these ?



2. Is there a DM3 with an i5 ? Costs ?



3. Is the size difference between closed DM4 and DM3 noticeable ?







My needs are build quality (the more metal the better),heavy internet surfing (lots of tabs), and PDF books.

I have a Q6600 with 8GB desktop, and I would like the same Windows 7 performance on my 13" laptop. Thanks !