It depends on what you're looking for. Strictly speaking your criteria isn't exactly an ultrabook.
Some to consider -
Asus TP500
Asus TP300
Acer s7 ($900 on sale at the MS Store)
Acer v5-v573g (this is the newest refresh with a GTX 850m DDR3)
Acer v5/v7s (range of configuration)
Lenovo Yoga 2 13 (its been on sale for under $1k in the config you want)