You can check out the mod chip sticky located in the ultimate sticky info. That will give you some info on different mod chips but to answer your question on is a duo2 good. Yes its ok for its price but you also said 100 for chip and install which is a bit on the high side. I guess if you dont have to ship it anywhere, its pretty close to what it would cost if you had shipping on top of the install cost. There are other chips that are better but thats only if you want high end features.
I use the Duo and it suits my needs.
Duo2 is a good choice!
