Until I got to the last line, I was just going to tell you to go for the HP DM1Z.
The Atom will do perfectly fine for your needs, but if you have the dough, I'd still suggest you go for the e350. It's a lot more faster in a lot of programs other than games. Since you don't need the gaming attributes of the net-top. I would suggest going for it, firstly screens bigger, secondly more powerful in nearly all aspects.
yup, the battery is rated for upto 5 Hrs with the e350.
No , the Atom is a dual core and will show only 2 cores but when it comes to mobility, AMD has the crown.
The Atom sucks when it comes under load and the e350 just flows.