First off, welcome!
You'll definitely want to upgrade the RAM to whatever its max is. RAM is so cheap nowadays it would be silly not to add more of it.
As for your questions, I'm afraid I can't give you much input. I own an eeePC, and love it. It's relatively cheap, but many netbook manufacturers are cranking them out for pretty low $$$. But do compare them in the stores first, and read others' reviews here and on other sites. I have no clue about Ubuntu, as I've never used that.
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Dave
Asus eeePC 1000HA w/ 10" WSVGA Active Matrix TFT Color LCD
Intel Atom N270 @1.6GHz, 2GB DDR2 SDRAM, 533MHz bus, 512kb cache
160GB Hard Drive (de-partitioned) (+250GB External Drive), Windows XP Home
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