Surface 2 (RT) prices should start at $399.
Microsoft need to get the pricing of the second generation devices right.
Now they don't have any pressure from OEMs because none of them are making any RT tablets. Also, most of them are bringing cheap windows 8 devices because Microsoft reducing the license fee and giving MS Office 2013 free for 8 and 10 inch tablets.
But the success of Windows 8 tablets will be judged based on the surface sales and they now have a good chance to make it succeed.
In my opinion they should price as below assuming the specs (based on rumors) as same as I mentioned.
1. Surface RT 2 (FULL HD display, Tegra 4): $399 (32GB).
With Touch Cover bundle: $449.
With Power Cover bundle: $499.
2. Surface Pro 2 (FULL HD display, Haswell core i5, 4 GB): $799 (64 GB). $899 (128 GB).
These are the same prices that they are selling surface pro now. The problem for first gen is mostly battery life. With haswell, it will be improved a lot.
3. Surface RT mini (FULL HD, SD800): $299 (32GB).
It should undercut iPAD mini ($329) which will come with retina display this time.