So, I decided to take a chance on the LK450 models again. I went to Future Shop to check out a few different models, but from the information I got, the LK450 are one of the few likely possibilities to have the full RGB chroma capabilities. I looked for a 37" with the "Y" code, but none had it, so I ended up "having" to get the 42" (heheh). It has the "Y" code, but I haven't really checked the pixel structure or anything to make sure it's actually an IPS. Set it up, did some very basic changes to "Game" mode and the temperature just to test it out, and it looks good (for the price, at least). The lag is less noticeable than on the 32" I tried before, and I'm pretty sure this is the best value I'm going to get in the price range.
Now, I haven't had enough time to check the panel itself yet. Since I've never had an IPS before, I'm just curious, does IPS still have slightly noticeable colour/image dropoff after a certain horizontal angle? Sitting at my (a little too close) computer seating of around 3 feet, I did notice some very slight issues in the corners, but about 8 feet away it doesn't seem to have any problems until I get to ~45 degrees on either side. Of course, I'm guessing the vertical angles aren't going to be great given it's an LCD and that seems to come with the technology. (edit: I meant ~45 degrees, not 90. It might actually still be okay past that, but that's about the farthest I looked.)
Also, I did a very quick check of the "belle nuit" chart, but I got home late and then got busy so I haven't had enough time to do something like a pixel shift comparison yet to test if it's doing 4:4:4 properly. It still looked pretty good from what I could tell, though.
edit: Okay, after a little more time with it, I'm noticing the lag again. But, at this point, I'm not really caring as much because it was cheap for a fairly good-looking 42", I'm probably not going to find a heck of a lot else that works, I've already lost my patience with the searching and shopping for a TV, and I'm not going to be using this long enough for it to be a huge deal for me. It's going to be passed off to a family member when I take off in about six months, so I can make it work until then.