Go with the Sharp Aquos. They are awesome TVs. I set one up for my client and it came out awesome once we calibrated it. The calibration is probably the most important part of getting a new tv.
As for the whole 120Mhz vs. 240Mhz+, its all a bunch of crap. The whole screen is still refreshing at 120Mhz. What they do is split the screen, so each half of the screen refreshes at 120Mhz, so that 120+120=240Mhz. You are better off spending the price difference on getting it calibrated properly, and getting a nice wall mount.
and i'd like to add that personally, after auditioning a NUMBER of TVs before i settled on one, the Aquos' blacks are much stronger than any other LCD. additionally, almost every other TV i looked at with the exception of the Aquos and the one i almost bought at the time (Sony Bravia), far too much posterization going on.
i'd stick with either Sharp or Sony (though i'd personally suggest the Sharp) unless you are going to go REALLY big.
We are going to look around tonight.
I need to call Time Warner Cable and see about getting the HD/DVR box. I'd like to have the HD/DVR box prior to delivery of the HDTV so all the hookups can be done only once.
The calibration is something I will have done also. I guess it's best to let the professional's do it on the Aquos. I've never tried it.
As far as the refresh rates go on the lcds, I'm with CD. Most people I know have turned it off. I've never really had a problem with the picture not refreshing fast enough.
edit: I still STRONGLY recommend the Panny or Samsung over the Sharp. The picture is better & I believe the build quality is better as well (IMHO). My Sharp has had problems after just a couple years, and I've known others who have had problems Sharps. When it comes to calibration, you can borrow my Digital Video Essentials disk.