If you have the opportunity to, I'd visit a local electronics store that carries the Razer BlackWidow just to try blues to see if you even like that type of plastic feel and tactility. You don't even have to open the box since Razer puts a window on it to test the arrow keys. I tried them the other day and they felt very cheap, but that's just me.
I'm currently using browns as a competitive gamer and someone who has to type a ton between school assignments, quick but lengthy forum responses, and other instances of long periods of typing, I'd have to say browns are your best bet if you're a balanced typist between games and typing. With that being said, for a mechanical keyboard, I would personally not purchase anything entitled a "mechanical keyboard for gaming" or one offered by any gaming product manufacturer other than CM Storm. I do not own one, but the general consensus on the CM Storm QuickFire Rapid is that it is comparable to a Filco, if not the exact same thing for almost half the price.
Another aspect of selecting the right switch for you would be to figure out if you smash keys, gently glide across them, or do something in the middle. You don't want something too firm since it looks like you'll be typing for extended periods of time (which rules out blacks), but you also don't want something
too light to the point where errors could be a consistent issue (which may or may not rule out reds depending on your confidence in your key strokes).
I highly recommend browns for the uses you've stated above. I also highly recommend considering purchasing a CM Storm QuickFire Rapid (someone else can definitely vouch for that board) or a Filco Majestouch 2. For around the same price as the SteelSeries 7G, you get a much better quality keyboard that, if for some reason you'd want to sell it, holds its resale value pretty darn well. Not really sure if you're looking for a TKL or full-size board, but CM Storm QFR for TKL and Filco Majestouch 2 for full-size if you have that kind of money to spend anyway.
Please DO NOT take what I've said above too heavily, after all it's just my opinion from my experience. I'm sure others will chime in and hopefully you'll be able to find the right keyboard to suit your needs once they do. Good luck in your search!
Thanks! OK then, what's a Brown board with as many of the above features as possible? With special attention to a big nice wrist pad?
Wrist pads can be purchased after market, but you may find that using a wrist pad can cause more discomfort than comfort, so I really wouldn't select a keyboard solely on this aspect.