Hi Patricia,
I have bought a myriad of ereaders but find myself using my Coby 7024 almost exclusively. It comes with Aldiko 2.0 pre-loaded which reads epubs and all the DRM'd epubs including Sony, Borders, B&N and others. I added the Nook and Kindle readers as well as Cool Reader and FBReader. I can read anything that they throw at me.
The Coby is a resistive screen as opposed to a capacitive screen but I like it better for reading (I had a Cruz). Tablets are more versatile therefore more difficult to set up but well worth it. Here is a link to the Coby:
http://www.amazon.com/Coby-MID7024-4.../dp/B004RCUUT8
Coby also makes the Coby 8024, an eight inch tablet, that you might want to consider.
Regards - John