Thanks.
I'm not sure what headphones i'm getting, but is the standard 450 mW enough to drive all the popular headphones such as Sennheiser HD800, AKG Q701 and so on? or should i add the 50$ to get the more powerful version?
If you're looking to drive a range of headphones you'll want to get the upgraded version. The HD800 and Q701 appreciate some power, so you'd want to get the Super Geek at least.