Hello, I'm new to the world of tablets, but am interested in getting one for college. Since I have no knowledge of tablets, I'm looking for some guidance. I am looking for a tablet about 7" in size. I need the tablet to use wifi. Mainly, I am planning to use it to check email, browse the web, read ebooks, and take notes. I would like to be able to use a stylus to take notes and able to open and write on powerpoints. A USB port would be helpful as well. I am looking to spend no more than $350. Any assistance would be greatly appreciated!