I buy and sell smaller amounts of bitcoins, so I make lots of transactions.

Intersango charge .65% for all transaction, and Mt.Gox charge .6%.  Intersango on these boards say that they still offer a competitive service if you think of the bigger picture (transfering monies in and out of your account) but Mt.Gox doesn't charge for GBP.

Is there a reason that anyone can see why I shouldn't start using Mt.Gox instead of Intersango?  Every little helps because I can't afford to leave my monies for too long in bitcoins so .05 is noticable.

Are there any other companies I should consider looking at as well?

Thanks in advance.