At that point, yes, go for an actual tablet. Unless you want to get technical and 'root' something like the Nook Tablet into a full blown tablet. In general, an actual tablet will do everything the 'ereader tablets' do, but the reverse is not true. Comparable screens, comparable battery life, etc.

Nexus 7 or iPad Mini are potentially the right way to go, in terms of full capability with in-the-bag portability.

But on the other hand, the Kindle Paperwhite is a beautiful ereader...