I just bought a Pro-Tek 610 on a Black Friday sale from A-Main and it is virtually identical to a Chinese made one I bought three years ago (it still works but it's only 50W). Same functions, same color backlight, same programming but a different case and buttons.
You can buy the more expensive chargers but they essentially work the same. The FMA chargers are made in the states but they are a bit pricey and work very well. I have one of their 4Amp Multi-Chemistry models, very good charger but a bit too complicated to use and only goes to 4amps.
The best charger I have is the iCharge 106B. It does everything and does it well. It isn't too expensive at $90.
Now all the chargers I mentioned require a power supply. I just picked up and tried out one from Hobbypartz. It's a 25Amp one that cost $30. I like it so far and it's smaller than the ones I was using.
Funny thing is that the worst charger I have was also the most expensive.