I came across this post so I decided to create an account and give my two cents....
I would personally higly recommended the HP Touchpad. HP discontinued the production of this product in August and had a fire sale of it at $100 for the 16gb and $180 for the 32gb (was originally around $500). They were sold out everywhere within three hours. HP then decided to manufacturer one last round of them due to the high demand. People were buying mass quantities of themand selling it for 2x the price on eBay. You can now find them for around $200, which is what I had to pay.
It has a large 9.7 inch screen, which is much larger than those tablets at the same price. This is ideal for reading sheet music. You can simply use the PDF reader on it or use the Kindle program to read the sheet music, which is what I do. I immediately installed Android's operating system on it, since WebOS sucks. If you have basic computer knowledge it is a very easy process and there is good instructions and videos on the internet. I could always provide help also. Android provides great benefits for your tablet, such as the Android market....not to mention Android is completely free. You could even download a tuner for free from the Android market, and there is also sheet music on there.
If you didn't want Android on it, WebOS comes preinstalled with Kindle.
If you have any other questions or want further information feel free to ask....same goes with anyone else. I consider myself technology inclined and a huge Android supporter, so I know what I'm talking about and would love to help out other saxophonist like myself!
Apple sucks and loves to control and limit their users experience. They are so overpriced because their consumers buy into the brand equity they have created and they do little to know research about alternative products.