I find this to be a suitable replacement made in the spirit of the nexus 7:
http://www.amazon.com/ASUS-ZenPad-Z580C-B1-BK-32-Tablet/dp/B011TVF5QC
There are different price points for more or less power. It has held its pep for the last 6 or 8 months. It doesn't run marshmallow however.