well, i went ahead and got one. I bought the A8N-SLI and have had problems with it, and to RMA the board they want like 3 weeks. No way am i waiting that long when i can get an ultra (which i wanted originally anyways) in less than a week for $80 less. I called novapcs and i'm just gonna send the SLI board back. Besides, i bought a 24-pin vantec Stealth 520W PSU for $92 at newegg, and i highly recommend it, very stable, quiet, nice, tons of connections, and good for future PCs as well (in case you haven't noticed, new boards (LGA775 and NF4) are 24-pin, i imagine this will continue so that the PCIe boards can run more stable.
Oh, and as far as the X800XL is concerned, i think it looks like a great card, but i don't hold much hope of ATI getting it out the door by january. Considering the "immediate availability" of the X850s never happened, i don't think we'll see X800/XL cards till february/march. I recommend just going with a 6600GT (i like XFX, and they have dual DVI) for $180 and being done with it. With the extra $120 you save, that will go a long way towards your next GPU upgrade.