Really depends on what your main purpose is. If it meets the Amazon requirements -- e.g. primarily for reading, video and mp3s then I don't think you're going to beat the Kindle Fire. If you want a Camera, GPS (e.g. google maps etc.) you should consider a generic Android tablet. I think you'll find the low-end ones will be limited in some way (no camera, storage, sd card slot etc) and be very similar to a Kindle Fire or a Nook.
I have a Xoom and love it, but I've also got a Fire on order and look forward to using it extensively around the house (or work) for reading.