Take a look at chris review video.
Consider to apply thermal mod for higher performance.
If you by this tablet from chinese stores you will spend about 380$
What I've used and what I've got:
TECLAST X98 AIR 3G, TECLAST X98 AIR II, TECLAST X98 PRO,CHUWI HI8, CHUWI HI12, CUBE I9