I bought a Toshiba Satellite L300D that came with a carrying case and a mouse for about $550. All the ultra-mobiles were priced around $450ish, And this wasn't the cheapest laptop I found either.
It has 2 GB of DDR2 ram, ATI Radeon 3100 Graphics, 141 GB total disk space in the default partitions, running an AMD Athlon 64 X2 QL-60 (I think it runs at 1.6 GHz) and it's a 17" display.
I was originally looking for one of those ultra-mobiles, like the eee, but decided against it. 10" really is a small screen, and with keyboards as small as those, I'd make even more typos than I already do, adjusting from a desktop to this keyboard. Not to mention I'd really be forced to only use it for typing, as opposed to being able to do more than just type on it, like I can on this. This computer is at least fast enough to play quite a few games, as well as do what I need for typing.
Think about things for a second: Laptops are hard to upgrade, you basically have to buy a new one when you want to make a major update, and that costs a lot more than just buying a new mobo and some new hardware. If you get an ultra-mobile, you're going to NEED to buy a new one if you decide you want to switch over and primarily use a laptop.
I own both a desktop and a laptop, but I am NEVER on my desktop any more. It's a pain to move around, and takes up more space than my laptop, especially with my dual screen setup, and speakers. And it's actually somewhat worse than my actual laptop's specs.
My desktop is running an AMD Athlon64 3800+ overclocked from 2.0 GHz to 2.46 GHz, 1 GB dual channel DDR ram, an ATI RADEON x550 (used to be overclocked), 400+ GB of disk space (both my laptop and desktop also have access to a 1 TB Networked Storage Device as well.)