OK thanks everyone for the great advice. I just ordered Windsor the Hour...sorry to disappoint all the Mercier-lovers but I got the Windsor mainly because of the price difference. I needed that extra cash to buy a helmet / a few parts / some good quality locks / lights / rack.
I'm sure it won't be the last one I buy, and I'll probably get the Kilo TT Pro when bikesdirect restocks them. I talked to the guy who works there and he said that probably won't be until around October, which is fine with me because by then I'll be used to the fixed gear ride. He also recommended the Hour as a starter bike, he said he just bought one for his wife.
The bike came with a rear brake and my bf has a front brake that he doesn't use anymore, so I've got the brakes covered. However, when I ride his bike I usually just use the front brake, which I might do with mine, I like to keep it simple.
Thanks again!