Wow... nobody home, I guess

lol
Well, the install was quite the ordeal:
Disconnecting the old PSU was a pain, given the small HTPC case I'm working with. Of course, after having it half connected, I then realized the 4-pin MB plug would not reach. This meant having to disconnect and flip the PSU over (fan is on the bottom doing nothing now, but at least the case was smart enough to have screw holes for both orientations).
The next problem I came across was the limited connections (that'll teach me for buying a cheap $45 PSU). The biggest drawback was that the Antec PSU that came with the case had an extra little plug for the LCD display. The new PSU doesn't have it, meaning no LCD, and no remote operation

The PSU also only had one PCIE connector meaning another cable (supplied) to get the 2nd. After much weaving and tucking (and finding that the power cable for the sound card is waaaaay too loose), I got everything installed. The GPU went in easily (after I removed the second bracket - never have owned a two-slot GPU before).

lol
The moment of truth and I turned the sucker on. Luckily no beeps. Guess I must have connected everything properly. After 5 minutes of spinning, Win 7 came on, in ugly 800x600 mode (I neglected to remove any drivers or tuning software from my old card). A little chugging, and Win 7 needed a restart... just as I was about to reinstall the driver. One restart later, and lo and behold, all my icons were back in place on my 1920x1080 screen, with the GTX 460 using my existing (and up to date) nvidia driver. Even MSI afterburner found the card and clock speeds without a problem. Turns out, I got the slightly overclocked version (720mhz on the core).
The GPU is nice and cool and quiet. It's idling at around 45C... a far cry from the 60C my 8800GT was idling at. I can't hear the fan at all. I'll try out some games, and then I may overclock this sucker

So, aside from the PSU being a bit of a bust, it was a worthwhile upgrade. It will give me a longer lifetime on this PC.
And something else weird: The GTX460 is using the HDMI output, which apparently also allows sound over HDMI. What's really weird is that I have a Xonar DX pumping optical 5.1 DD to my receiver, and yet Skype is using the HDMI audio output to the TV... simultaneously. I am currently playing 5.1 DD live music through my receiver, while playing Skype sounds through the TV. And I didn't even set anything up that way! Not that I'm complaining; that's a pretty cool feature, meaning I will hear my Skype calls clearly.