Debating between a few different ultrabooks

So I am in need of a new ultrabook and I have narrowed my search down to four. I am hoping I can have some computer experts can help me determine the best value for my buck.

{Acer Aspire S7-392-6807} -- $1,169. 13.3", i5-4200U, 8GB, 128 SSD, 2560 x 1440, .51" depth

{Sony VAIO Pro 13 Touchscreen Ultrabook SVP1321DCXS} -- $1,199. 13.3", i7-4500U, 8GB, 128 SSD, 1080p, .68"

{Samsung ATIV Book 9 Plus NP940X3G-S03US} -- $1,304. 13.3", i5-4500U, 8GB, 128 SSD, 3200 x 1800, .54"

All three have their pros and cons.
The Acer has the lowest price, is the thinnest, and has 1440p. The negative is that it's only an i5.
The Sony has the i7 processor, but it has two negatives in that it is 1080p and is the thickest.
The Samsung has the best resolution but it is only i5 and is $150 more than the Acer.

Is Sony's i7 worth the drop in resolution? Is Samsung's 1800p resolution worth the extra $150? Or is the Acer the best all-around package?