the phenom x6 will be more future proof and more efficient as 6 physical cores are better then hyperthreading, and for gaming it is more the capable of running any game at maximum settings and yes sometimes it is slower than core i5 in games but future games (and some current) uses 6 and 8 core like gta4 and resident evil 5, so it will be better in future than core i5 and will be easy to upgrade without changing the motherboard.
Since the 1035T should be considerably cheaper when released, if you actually mean the 1035t, than definitely get that if you plan to overclock. If not, then the 1055T is still cheaper, and will give you the performance you need, especially if you plan to overclock. The Phenom II X4 955 is even cheaper again, and it will work for your uses just fine at a higher starting clock, but two less cores.
Unless you are doing some professional applications that benefit heavily from Intel's architecture or are gaming with more than two GPUs, which I strongly advise against anyway, there really is no reason to go with an Intel setup for the money. (i5 750 user here)
I'd like to know the overall price for both systems.
If the X6 1035T runs $100~$125 less than the i7 860 I'd feel OK about getting a bit less CPU power and saving that amount if they have the same video card. All 3 CPUs are actually quite good for gaming.
I'm more of a relaxed gamer so I don't get excited over what is the 'best' when either one will be 'fun'.
Any one of those is nearing a 'kicks butt' rating for an OEM machine.
I'd be happy with a i5 750 & 4GB RAM if it's going to get me a couple extra interesting games for the same price.
That GTX 460 video card in that system AMW1011 linked is far better option for gaming, together with the i5-750 CPU.
Passmark GPU score: GeForce GTX 460 = 2214
Excellent quality parts too - Gigabyte motherboard, Corsair PSU, Evga video card.