I have been looking into the HTPC for some time now, what is your basic setup?
I'm atypical in that we change hardware frequently as my wife and I are both tech nerds. It started as a Core2Duo, then became a Q6000, now it's an overclocked 4.3ghz i7-2600k with a 580gtx. That's extreme overkill for most people if you just want a media pc though, I built it beefy because I use it as a render mule for my business and I play pc games on it as well, on top of media duties like watching blu-ray movies, doing skype calls back home, websurfing, etc... A single hdmi cable goes to my a/v receiver and it all works. Most here don't care about pc gaming so a $50 video card would be plenty. On the high end that would make it:
$315 Core i7-2600k, overlockable to ~4.3 - 4.8ghz on air cooling.
$159 Asus P8P67 Pro mobo
$50 video card
$50 ram
...and just reuse your case and hdd. But that's high end and way overkill for most, you can build a pc that will work for a fraction of that since the $50 video card will do all the video decoding anyways. A $200 machine (core2duo, 4gb ram, $50 video card) would work fine. Personally I'd spend more to be able to play pc games and you'll save that money back in no time anyways as pc games are cheaper than console games and look and run far better as a bonus.
And how "complete" are they manageable just with a remote? From my experience its either problematic to turn them on (which might take a while aswell) or they suck gobs of power in standby.
PC's have sleep mode, they come out of that in a second or two, much faster than any console does powering up. In sleep mode they also use very little power. You can use hibernate mode if you prefer then they use zero power, but then they take 5 to 10 seconds to power up. With sleep mode the consoles have no hope of keeping pace, I can go from sleep mode to watching a blu-ray movie faster than it takes a PS3 to just power up and get to xmb. It's no contest, if it's speed you want then a console is the last thing you should be using.
Also, with a console often you have to keep a pc on all the time somewhere in the house to handle being a media server or transcoding duties. That's not necessary if you just use a pc to begin with. No need to transcode, it plays all formats natively and no need for a media server, the pc can play any file directly from hdd, raid, or whereever. You also don't have to worry about the media server software getting messed up, network connections, dropped connections, etc, all problems that happen when trying to use a console that depends on media server software running on a pc. None of those issues are an issue if you just use a pc to begin with.
Remotes do work, the remote that came with my 360 works fine, and the 360 gamepad works fine as well but I don't use them for the most part. I have a bluetooth mouse and keyboard that I use from the couch, but by and large the mouse is all you need and I leave the keyboard stored away in the coffee table. Simply come out of sleep mode, launch whatever app you want and go.
I putzd around with the consoles like you guys did ages ago and gave up when I realized they will always be crappy media players due to their respective makers wanting to protect their investments (online movie streaming, bluray discs, etc...), so they have built in obsolescence that will never change. Hence I switched to pc and never looked back. It's just fascinating to me to watch the continued trials and tribulations over many years of people still trying to get consoles to properly play media, when a pc has been doing it flawlessly for ages now.
Unless this is all more about the exercise of seeing if it's possible to circumvent all the blocks the console makers put in to make it not possible to have them be play-all media servers? In that case I get it if it's just from a hobbyist point of view to see if eventually if can be possible. I guess I kind of lost interest in that sometime ago,and I just want something that works all the time, hence pc.