I've got an Acer, HP, and Lenovo, and it's a toss up across the entire board.
The Lenovo wins in "screen readability" and ease of adding bluetooth and RAM.
The HP keyboard is tops. Edge to edge with more roomy layout.
The Acer is the most affordable of the three.
All three have Atom N270 procs with the Lenovo having 2GB ram/128GB SSD HDD, and the others are 1GB RAM/80GB HDD.
This is all opinion though. Go pick out the one you like the best. Be practical, a netbook isn't for everyone, but are definitely handy.