lchiu7: You can purchase the Popcorn Hour C200 for US$299+US$30 for shipping here so that's about $450. And if you don't need BD playback the A210 is equally as good for $199+shipping òr about $310. And the WAF for the PCH is way better than for a HTPC but of course the HTPC can record where as the PCH can't. But we are talking about media extenders here.
Furthermore I presume the $690 for the HTPC does not include another $120 or so for a Windows licence plus an IR reeiver and remote.
As usual YMMV.
Well, you could buy 3 Apacer al460 media extenders for less than the cost of 1 A210 today, while they are still in stock. Admittedly, it's a limited offer though, so not a real comparison.
http://www.firstin.co.nz/products/apacer-1080p-ethernet-media-player-3970/
hope it works :-)