You can go for the Nook. Nook Simple Touch costs $110. It has Wi-Fi connectivity but no 3G. On the other hand if you go for the Kindle PaperWhite that costs $120, you will get tons of ads visible on the screensaver/lock screen and on the Home screen at the bottom.
Two years old, but http://www.mobileread.com/forums/showthread.php?t=141491Does it have a web browser though? I would say Nexus 7.