you could make your own SAM with graphs and tables or convince someone else to do it :p
That was the reason I made JUAIseek before.
EDIT: the reason being there wasn't a free UAI estimator or the latest data wasn't being used by SAM.
I would suggest one of the iRiver HDD players if you don't mind the chunkyness.
http://www.iriver.com.au/iriver/index.cfm?pageID=2&sID=2&prodID=9&
(It really is quite chunky in terms of thickness)
Ohterwise, get a sony one. However, you will have to deal with the bad software.
like...
I don't think you can do general if you do 4U maths.
In regards to dropping from 2U to general, it really depends on what you want to learn. If your planing to do anything science/engineering related general maths will basicly do you no good at all. 2U doesn't really help either, you really...