I think you have to monitor all the exchanges for opportunities..
Im working on bringing up a website AIOBTC which can facilitate many things. I have researched arbitrage and I think it has dies up since mt. gox went down. Do you think that if we have a huge amound of money, say 100
BTC to trade daily
can we make profits without any risks?
You can probably make a large amount of money on a relative scale however this will not be reflective of your overall performance. On a percentage basis you will probably not do all that well (on a NPV basis)