I'd vote mtgox, but they actually require to see your voter registration to allow trading into US dollars, my local currency, and I haven't furnished it. As well as state issued photo ident. You can buy them from me! I will accept either document as authentic proof, otherwise in #bitcoin-OTC on Irc.free node.net they are rather partial to the Gpg key as the mode for proving identity and tracking of scammers.

Don't you want to upgrade your currency, to the one where charge backs can not ever be issued against you, and its the whole world and science that keeps your money safe from hackers?

Bitinstant.com is the easiest. Just create a pending transaction on theie site (give them one of your bitcoin addresses, and tell them how much you want to buy) They give you a bank account #, and you just walk into that nearby bank with cash, fill out the deposit slip, and wait about 30 mins.

It depends on where in the world you are. http://howdoyoubuybitcoins.com/ may be helpful.