I have a Toshiba T135 with the SU4100 CPU. While the models with the AMD Turion Neo X2 and the SU2700 are fairly anemic, the SU4100 is actually a Core 2 CU despite the name, so it’s pretty decent; about three times the power of a netbook. It also is expandable, though with it’s 320GB drive (double that of a netbook) and 3GB RAM (triple that of a netbook). You would not be ashamed to use it as an everyday system,
It weighs under 4 pounds and the 13.3” screen has enough resolution that it won’t cut the bottom off of the windows of certain apps or cause you to scroll a lot like the 1024×600 screen of most netbooks will.
I get over five hours out of mine, and I tend to do things that draw a little more power than average, so you could easily go over six.
The MSRP on this model is $650, but I got mine for $500. That actually makes it comparable in price to many netbooks.
If you want to save a pound and a little money, and you can deal with a much slower machine with a smaller, lower resolution screen then I would go for the Acer Aspire One. They are quicker than most other netbooks, less expensive, and pretty well-built. Mine has seen some use and a bit of abuse, yet it’s still ticking just like new.