As if 8 characters isn't difficult enough to put in mind
This attitude is exactly why brainwallet.org shut down its service.
There are a lot of different ways to handle strong passwords, the easies being password managers.
An average 8 characters password can be brute-forced in less than 4 weeks, with a single PC. It's your money, so do what you like. But please don't complain about service providers caring about your security.