I'm not sure what you're actually after now.
The fit-PC and the computer you selected are very different products.
The fit-PC consumes little electricity which is nice for 24/7 operation and makes no noise whatsoever. Like I said, there are better alternatives if size isn't an issue but the affordable ones are all quite limited compared to mainstream PCs.
The Asrock is a mainstream PC, except it uses laptop parts which make it expensive. I'm not sure what benefit exactly you get for paying so much. Maybe they consume substantially less elecricity than cheaper desktop alternatives? Laptop parts are typically sold at very high prices (if at all) to consumers so I doubt you could build something that's as good in all respects yourself.
But I suspect you could build something less noisy for less money however. I don't know for sure because vague specs aren't very useful. But the product you're looking at is anything like this one, it's to be avoided because you can do much better: http://www.anandtech.com/show/3824/asro ... -market/11
So the question is: do you want a totally silent PC after all or not?
Because if you're OK with a little noise, you can build yourself something quite nice without spending too much. You can use very powerful CPUs compared to your nettop's with this energy-efficient motherboard which takes electricity from a standard AC/DC brick instead of a noisy or expensive PC power supply for instance: http://www.intel.com/content/www/us/en/ ... h61ag.html
If you want something totally silent on the other hand, you basically have three choices:
-use hardware that's comparable to your nettop (a bit better perhaps)
-accept very high temperatures which are not recommended by the manufacturers and may cause your computer to fail early
-spend a lot of money on an exotic cooling solution
My general approach would be to use nettop-type hardware for 24/7 home servers and to use separate computers for desktop or HTPC tasks.
Especially if you want to use a VM, desktop performance won't be great with nettop-type hardware. Some people are OK with that but it makes less sense now than it did until about a year ago when mainstream PC gear bridged some of the gap with nettop gear in terms of noise and power consumption.
So if you want an all-in-one unit and unless you're a total silence fanatic, I would recommend accepting a little noise and going with mainstream PC hardware. If nothing else, such a computer would be likely to remain useful longer while current nettops might be obsoleted as soon as 2013 if Intel delivers on its promises. Running a file/print/torrent server on obsoleted hardware is fine but desktop VMs and video transcoding are something else.
About transcoding, the trouble is that the sky's the limit as far as compression is concerened. I've only encountered 720p and especially 1080p files which would be hard to transcode but I've not been looking for difficult 576p files. With the same compression method, a 576p file would be much easier to transcode than a 1080p but who knows what compression methods people will decide to use?
If you only want to make sure you could easily transcode the particular type of 576p file you've been using, perhaps you could tell us how your nettop handles them...