how high is that standard of yours, last time i checked people still game on LGA775 core2duo with IGPs and AMD E350 notebooks and they can.
what? the i5u is slower than a celeron? http://ark.intel.com/compare/65707,53418
please tell me how, turbo at the same frequency, has more cache, has HT, has a faster IGP, has a faster memory controller which means higher memory bandwidth. how the heck is this slower.
we're talking about gaming on an ultrabook for christ sake, if you can link a trinity ultrabook that can game then sure you can recommend that.
Turbo boost isn't universal between the amount of cores used, 2.6ghz is the rating for when only a single core is boosted. It's 2.3ghz for when two cores are boosted simultaneously. My i7m is rated for "3.3ghz", however in the real world it caps out at 3.1 as well. And HT is nice for someone who is coding or the like, but while we're discussing gaming, it makes absolutely no difference.
HP Sleekbook 6z come with either a A6-4455m or a A10-4655m.
That Vaio comes with a hybrid HDD, while not as good as true SSD, it shouldn't be too bad to use.
Oh, and since you're so adamant at HD4000's being good enough nowadays. There you go, GW2, a popular new game. Here's a very quick test I just did, near a dull area, no one around me, while standing still i get 23fps.
Sorry mate, I consider that unplayable.
p.s. I'm using a far faster CPU than the one in op's listings(i7-3610qm)
Also, do remember, that all of the consoles will basically switch out to a new generation come a year or two. It will make games a lot more graphically intensive than they are now.