Sure, I've got lots of thoughts on this subject.
I'll try to just make it easy for you though. IF light is not a concern *and* you don't care about 3D, *and* you have no interest in regularly using your HTPC as a "PC" (i.e browsing the web on it or something), then a projector will give you greater size with good sharpness. It is *not* pixel-level sharpness, which is what an LCD or Plasma will get you, so it's not ideal for reading small text, e.g. a website, but it *does* make movies look good.
In fact some would argue a projector makes movies look better than LCD or Plasma, at least in the right viewing conditions (darkness and a good projection surface, ideally a professional screen). This is because pure digital, pixel-level detail is actually not necessarily a good thing. What projectors and analog TVs do is kind of "fill in the details" a bit, at least in a sense (not literally; no *new* and "correct" information is generated). You may have witnessed this phenomenon yourself in fact where, for example, seeing old broadcast TV on an LCD TV of similar size to an analog TV somehow still looks way worse. Why? Because it is displaying *exactly what is in the signal and nothing more*. An analog TV is a bit "softer", but since there is not much resolution in a standard definition signal to begin with, the slight softening is actually a good thing; it makes things look better. Now when you have a good quality projector the resolution is much higher so detail *is* presented fairly clearly, but there is still a bit of "softening", especially on larger projection surfaces (e.g. 10'), and this again can actually enhance the viewing experience, *particularly* at those large sizes and/or with lower resolution source content. I'd rather watch crappy YouTube videos on a projector than an LCD for example.
Anyway all this does assume that you have a place in your house where you can effectively mount and project a 10' picture. If you do, you will be in love with the combination of size and quality it can create in a dark room. The majority of people do *not* have the luxury of that kind of space nor ability to dedicate a room more or less to media appreciation (i.e. a "theater room"), and a projector in a more mixed environment like a living room may not be ideal, unless you spend a bit of money to mount your projector recessed, along with your screen (because surely nobody wants a 10'+ space of blank wall in their living room, right?
Anyway, I *do* use my 52" Plasma for computer activities, so I prefer it to a projector, but if I had the space and a dedicated "theater" room I'd probably go projector, especially with the costs of LCDs over 60". All that being said if I had the money I might just go for this:http://gizmodo.com/#...ds-largest-plasma-tv