If you do think about building your own board, consider the fact that you will need to program the chip with a boot loader in some way unless you buy a ready programmed chip.
I have several Arduino clones (UNO R3, Mega R3, Mega ADK R3, Nano V3.0, Pro Mini, Leonardo, plus a couple home-built ones), and except for the home-made ones, all of them are made in China. I've never had absolutely any problems with any of them. A Mega R2 was my first, and it was abused quite a bit by me, until I gave it a friend of mine, who also makes it undergo quite a bit of stress quite often. That Arduino is still alive and kicking up to this day.I would prefer a lot to have an original, but it is quite a hassle to get them in Brazil (anything that costs over US$ 50 gets taxed in 105%, and that also applies to any S&H paid) . The real deal Arduinos cost over US$ 150 here, plus you have the danger of people trying to pass clones as originals for about US$ 100.