Originally Posted by mayabong

If you want a light weight client use http://electrum.org/

I use Blockchain.info wallet. Apparently its very secure. Its all encrypted, so even if someone broke into the site, all they would see is your encrypted wallet. Be sure to use 2 factor Auth, and back up your wallet (it takes 1 click to email it to yourself). Do no use Android app I hear it might have some security issues.