Just my 2 cents, but you may want to look at the PocketBook line and the Astak pocket pro. If I hadn't just bought my 505, I 'd have either of those. But also realize the consumer electronics show just happened this week here in the US (you didn't say where you live) and there are likely some really cool products coming out in the next 4 to 6 months. Astak and PocketBook both have forums here so you can read the reviews there.
If you post your specific questions on the Astak and/or Pocketbook forums, you can likely get company representatives to answer your questions as they do monitor those forums. By the way, if you are in the US,
www.frys.com has a deal on the Astak PocketPro.
The main thing is to focus on the features that are the deal breaker for you and buy the product that is right for YOU.
Good luck!
