To the Topic Owner:
I have already voted and said many things about the advantage of PC, but here are some other general arguments regarding high end rigs opposed to the PS4:
First, I myself bought a good notebook earlier this year which is capable of running the flawed PC version of GTA IV in 720 p, high details and 30 fps and many other titles in full HD (Darksiders in 1080p looks gorgeous btw). But it is not a high end machine. So, two things to consider in this matter: this is really not the time to buy a high end PC, since the ports are usually not optimized even if current PCs are more powerful than the two incoming consoles (I think mine is, CPU wise, better than those but not in the GPU department), giving the PS4 a good advantage in graphics at the start, especially compared to similar priced (about 600 bucks) PCs. If you intend to buy a killer machine, wait one or maybe two more years to see how much better the graphics cards will be since the leap is going to be HUGE now the old tech is not an issue anymore. But the second thing is: early console machines tend to be troublesome. AND the PS4 will only receive a fraction of the games supposed to come to PC the next year or two. So you have the risk of a buggy machine with fewer options to play.
So, my verdict: you already got a WiiU that will keep you busy with the exclusives. In this scenario I would buy a reasonably priced PC, play the heck out of it and in one, two or even three years decide between upgrading it or buying a PS4, which will be rocking, probably, by then and bugs free. Add to it the fact that you will become smarter by having to deal with PC stuff (drives, languages, etc.) and there ya go.