As of now, I can surely say The NRev and most likely the PS3.
HOWEVER...I want to see which will have the software I want. The next console war is shaping up to be a heated one, and I hope it rivals the 16-bit days, when grade school kids would get into fights over which system is better...That happened a few times when I was a kid. I just said "I don't own an SNES, I don't which is better." I didn't try one until -1999. When shit like that happens, you usually see an awesome influx of software/peripherals. I mean, shit, the Genesis has the second largest US game library ever next to the NES, and the SNES has an equally good 3rd largest library. (NES: 1200 titles, SG: 700 Titles, SNES: 500 Titles).
As of now, it's still up in the air, and I'm not an early adopter with consoles anymore...Mr. Dreamcast and Mrs. Cube don't have much stuff for them coming out

.
Personally, I think seeing Unreal 3 running on a PS3 makes it compelling, but the Xbox has a faster GPU.
BUT...Sony's console durability is pretty fucking poor, and sending it in for repairs after a "90-Day Warranty" (LOL!) is a pain in the ass. I mean, my PlayStation 1 (Orignal Atari XE looking one) is a fucking joke. I have to push down on the disc securing mechanism when removing it, because it will come off on the fucking CD. And if you lose that, it's all over.
Every Nintendo/Sega/M$ console I've owned or used are built like fucking tanks, and they've never given me sass except for a bizzarre Genesis mobo glitch where my up button would stop working, and Sonic 3 special stages would speed up at the wrong intervals, or not speed up at all. They fixed it in two weeks, so I can't bitch. It ain't Sega's fault, I think the chipset was bad. That's excluding the NES, but a philips head and alchohol will fix it.
I'm also not buying anything until the Nintendo Revolution's specs are revealed, because I end up buying my "wanted" system and a Nintendo system (My only Nex-Gen consoles are a Dreamcast and a GameCube). Why? Zelda. The WindWaker sucked, it was too arcade like, and it gave you no motivation to play on besides a trippy scene of Hyrule underwater. But every game desinger fucks up along the way once and a while, so I'm not concerned.