Have you thought about the HP Touchpad? Easy to install Android 4.0.4 Ice Cream Sandwich on it and make it a dual boot tablet, so you can use either WebOS or Android. I have one and it works great. Considering Android is an alpha build it is amazingly stable. Only things Cyanogen mods don't have working yet is the camera and mic. If needed, just boot into WebOS.
Looks like they go for between $150 and $200 on ebay.