It's too bad you're a bit late for the end of the X61 series (they just got phased out) ... X61s was $560ish at the lowest
Anyways, Acer's netbooks (well, just the Aspire One) is actually pretty legit. Asus is pretty solid, but I personally think they suck aesthetically. Lenovo's netbook (the S10) is actually sorta meh cuz of the crappy keyboard
If you want a solid computer, I would definitely recommend a Thinkpad. I just dunno which one to recommend, cuz again, they JUST phased out the X61 models so all that's up there now is the X200 series (which is much more expensive). You could check out the
Lenovo Outlet .. They have some new
X61 series computers for about $700-800 -- more than it was when it was getting phased out but still decent. Then again, I can't remember if the X61s has a DVD drive. Possibly not. Argh.
If you're okay with something bigger (14-15"), check out the T series. The T400 is pretty decently priced right now. (See
the outlet again -- the one for $653 is pretty nice, just grab 2GB of ram from newegg)
If you do decide to go Lenovo, you can buy through the CPP site:
www.lenovo.com/cpp / password: familyandfriends for an extra discount. Lenovo almost ALWAYS has coupons so make sure you look for them.
ONE BIG NOTE ABOUT LENOVO: They have awesome computers, but their customer service really sucks. Like, really, really sucks. You can check on their forums if you want to read a bunch of complaints/horror stories. Shipping also takes forever because they ship from Hong Kong / China and they always seem to get held up in customs (mine did). I also ordered an Accidental Protection warranty that isn't valid in my state and didn't find out it wasn't valid until AFTERwards when they sent me the service contract... they didn't have any fine print or footnotes or ANYTHING prior to my purchase saying it wasn't valid (their site should just prevent invalid purchases from checking out but it doesn't)... then it took about a month + 5-6 phone calls to CSR to get it refunded and get a normal extended warranty in place.