A 2.5ghz cpu is a big hulk compared to what you find in consumer grade equipment. So that was what my comparison was aimed at.
You cant cool a cpu with a 120mm fan on the chassis - without buying a big bulky heatsink and paying a heft premium for it in India. So where is the cheap htpc factor again? And if you haven't realized how disturbing a cpu fan @35db is then you are really lucky!!
OK a projector might mask the disturbance, but trust me you still lose out on real *shaanti*, and one noise does not not cancel the other out.
Anyways its one's philosophy against another's not one's knowledge against another's. I had planned on building my htpc in April now postponed it because I could not acquire the heatsink that will let run it fanless - with only a 120mm low rpm fan on my psu like you indicated.
The intel e5200 may be lowest of low end bit its still a monster for this application to me
Edit: my point was - once you go for an intel G45 and a cpu that has to do a lot of grunting to display fullHD, you close the door forever on the future for true silent computing. Never mind if the cpu shuts down its gates when not in use. When you use it, you either make it noisy and cool or let it overheat and breakdown sooner than later.
Cheers