By CPU intensive, if you mean multi threaded ie capable of utilizing as many cores as possible then the Phenom II X6 is the choice.But other than that there are quite a few games in which the i7 quad cores take the lead.But for overall performance the AMD will provide you with more value for money.
As for ram, get the corsair. There will be no benefit from the other ones.
Edit: one more note on the ram. It will work, but it is triple channel. Your motherboard supports dual channel so if you put in that ram, it will run in single channel mode. And no performance benefit from that. But really, there isn't too much of a performance increase for multi-channel ram anyway.
I'm also going to recommend the cheaper 2.8GHz 1055t if you are overclocking. $100 less, locked multi but from what I have seen, it overclocks the same.