Yeah, I already had WoG on WiiWare, and bought it during a previous name your price sale of that game alone.
Not very far along, but Aquaria seems like it has the potential to be an underwater Metroid. I played Lugaru for about 15 minutes, not enough to develop feelings on it. I have devoted most of my time since the purchase playing Penumbra, and I'll reiterate: it rules--- this game alone justifies the bundle purchase, despite already having WoG. Haven't touched Gish yet.
As for the Senns, no, I've never tried those. I've read reviews stating that they are decent and probably worth about what they cost, but not quite up to Grado's level of detail in the mids and highs. They do probably have the edge in comfort and style, though. I'll say I am extremely pleased with my 80s, and would recommend them to anyone. Some say they're a bit uncomfy, but I'm plenty happy with their feel after breaking them in a bit. Throw in the Made in USA aspect, and I probably will never stray from this brand for future purchases. (I am considering something high-end, probably won't bite too soon though.)