I've used n800, n810 and n900 - all have a problem of screen size imho.
I've used WebDT and cheapo Android - nice screen size, but the webdt has battery problems, and the Android tablet just sucks due to its slowness and built quality.
I got me an iPad2 two, three weeks ago - and have been using ever since. SWMBO likes it much better than any of the other remotes. Yep, it is more expensive, but SWMBOs love it.