I just swapped a Hyper TX2 for a Xigmatek 1283 and got exactly the same temps on an OC'ed e7300. See my post under cooling for more details.
Most review websites show the AC7 and Hyper TX2 at about the same cooling ability. SilentPC shows the Xigmatek cooling about 10 degrees better than the Hyper TX2, but my system shows that to be false. I don't know which "review" websites are funded by which companies, but I wouldn't believe all the fancy charts because I've found many to be unfounded. They've sent me off buying different products (which is their goal, of course), with little except wasted time and similar results in the end.
I'd recommend buying whichever of the 3 (AC7, Hyper TX2, or Xig) is least expensive at the time (they all go on and off sale often). Frys has the Hyper for $17 right now. The AC7 I've seen for $22 in Bens Bargains. The Xig is on sale from Newegg for $27 AR with a 10' USB cable.
Just my 2 cents.