I have no experience and little knowledge with peltiers but what I can say is that the Ultra 120 Extreme is a true cooling behemoth, right on par with the Tuniq Tower 120, you can't get any better on air than that.
The peltier weighs in at 900+ grams. I hope it does not bend the mobo!
Go for the 120 extreme just to be safe and save half the cost. Besides the peltier will only cool the CPU a few degrees more than the 120 extreme...hmm a few degrees for $50-$70. No brainer!
The Ultra-120 Extreme is about the same at 790g. The reason I was asking about the Ultra Thermo Electric is because I've seen a lot of images/videos with people using it and it looks to do a rather good job as well.
I have a thermal electric and I got a q9650 up to 4ghz with it max temp with prime 95 running was 75c (speedfan). Without turning off any cpu features. Befor that I had an arctic cooler pro7 cpu was at 3.6 ghz and prime95 would go past 80c in about a second and I would shut it down.