In general, you would probably want something that charges fast and has good battery life, as most devices that have a stylus have extra-sensitive screens for that reason, and I'll let you weigh the risk vs. reward in that regard. However, as for you other concern on size that honestly depends on what you will use said device for. Another thing you may want to think about is compatibility, as in will you need an added graphics card or media card, or even other miscellaneous needs depending on your device. Price will be a pain in the @$$ no matter what, as harsh as it is too say get used to it. That's my two sense.