I just wish there was an easy way to go USD into the bitcoin market. Currently mining and waiting for dwolla but its slow going.
You can wire your money into MtGox account. However I do not like 0,65% commision on trades. It is higher than on stock exchanges!
Only if you're trading more than $1,000 (USD) worth will your commission be more than $7. I haven't personally traded on the stock market, but I thought $7 is what e-trade and whatnot tend to charge...
If you're dealing with more than $1,000 of bitcoins, then good for you and yes, it's probably worth it to try to find another way of obtaining that many. However, at that point it's probably worth it to have mtgox do the work of finding that many for you to buy.