The thin clients looks nice, but don't have room for much upgrades, and probably won't allow much more RAM than is already installed. The processor will have a limit which might irritate you later on...
They are made for mass computer labs at schools, or at libraries, coffee shops, etc. They are usually cheap compared to other computers, and in my advice sometimes worth it.
I have a hp pavillion slimline which isn't exactly a thin client, but it is a small version of the HP pavillion.
It's quiet, and works great despite all the crap I've put it through. It has low limits though, like max 4GB RAM, and a max cpu at 2.6ghz or so...
You can try getting a netbook but i doubt those are any good...
My advice get a pavilion slimline, and work with one of those.
here's a link to the newer models:
http://www.shopping.hp.com/webapp/shopping/series_can.do?storeName=computer_store&landing=desktops&a1=Category&v1=Slim%20and%20sleek&jumpid=in_R329_prodexp/hhoslp/psg/lateralnav_slim_sleek_desktopsHope that helps!
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