What if I transfer the money directly to Mt. Gox. I just need a place for the money to sit until I want to trade it. Is Mt. Gox secure? If I wanted to put money into bitcoins for the longterm should I go with Mt. Gox or just purchase it straight out of My Wallet.
I trust Mt. Gox but keep most of my BTC offline on a pc & thumb drive that is not connected to the internet. If you send the cash to Gox you will pay the Bit Instant Fee and then the Gox trade fee as well as the Zip Zap fee. Less fees if you just send it to your wallet address. But not by much.
If you want to be able to trade right away or at a moments notice (unless the Gox lag sets in) send it to Gox.