I would also suggest starting out with some $10s HU SNG and then going up to $20 HU SNG if you are having a nice progress. I think you should stick to HU SNG's untill you have build up a big enough bankroll to play like $100 or $200 cash. As far as I know it is first at the $200 NL that the rake becomes "acceptable", although it is most certainly possible to beat HU cash at the lower stakes if you are good enough.
http://forumserver.twoplustwo.com/showfl...rt=all&vc=1
The above link will give you some information about how likely you are to be a winning HU SNG player, if you should choose to play them while building your roll.
gl!