Even i am looking for same. I think you should wait some more because Full HD , highly affordable windows tablets are coming . Thinkpad 8 was recently launched with FHD Screen. Dell Venue pro 11 is in the line, again with fhd screen. Anything less than FHD would be a regrettable decision IMO because we all have been spoiled by the resolution on phones and android/apple tablets.
Another important consideration is screen size and weight. What is the use of a convertible hybrid if it is heavy in Tablet mode. I think Thinkpad 8 as a tablet and connected to a monitor as a PC will be the best combo. However ,i will wait and watch what other products are in the line.