I like the look of the Wanahao.
I'd avoid plastic framed printers like the plague, Aluminium or Steel construction at least means you have a good base for a rebuild or upgrade project at some future point.
Nozzles and Throats which aren't commonly available as generic spares are a bad idea as are machines not running the most popular open-source firmware versions.
Printers with the hot end and nozzle very close to the extruder drive may well prove problematic should you wish to print one of the more flexible filaments,

- Nick