I highly recommend a 10in android tablet.
I have a 10in tablet and a 6in ereader. While I "can" read comics on the ereader, it is so messy that it isn't worth the hassle. The tablet, while not perfect, pretty much displays how I want it too.
And I recommend Comicrack as your ecomic manager. Especially as it can be on your computer and on an android device and alloys syncing. Which is cool