It comes down to what you want to do with it
If you want to do just some surf around and office work even the eeePC 701 would be okay and it should just cost around 284 $!
Ok the 7 inch screen may be to small for you...then you may consider the eeePC 900 (8,9" screen)...It should be a pretty neat deal because it's the last eeePC without glossy finish + has 20 GB (4GB Fast ssd for OS + 16 GB slower SSD if you pickup the Linux version (if it's avaible in your country - in germany it's not...)
But the non-atom Netbooks aren't that great in the time they last before charging (e.g. the eeePC 901 lasts with the 6 cell 6600 mAh battery for around 6 hours (and even 8800 mAh batterys are avaible))
I myself may buy one of those 10400 mAh batterys for my eeePC 701 but it will be very big and lift up the eeePC (but hey...up to 7 hours
)
you should take in consideration what you need and how much money it is worth you...and if it should be your all day comrade, is a glossy finish acceptable for you? (for me it isn't...)
I never really used the MSI Wind/Akoya Mini, Acer Aspire one or dell mini etc. so I can just speak for the eeePC
It's really solid and has a good performance (701 4G: booting XP(not that much optimized) in around 30 seconds, get around 30 FPS in WoW (ok not in ogrimar)) + a large userbase, so if there's a problem which requires a tweak someone will find this tweak quite fast + it's Wlan is perfect...way better than my Desktop integrated one + netgear PCI card (yeah I've dual Wlan because I had a spare card o_o')
If you got a spare windows XP license or a OEM license for your desktop (so you can still use that license for a portable machine) you could buy a cheap linux version and optimize your windows XP with nLite (my XP installation just takes 600 MB) or just stay at the linux if you just want to chat, surf the web and use open office