Assuming you knew the dictionary and just wanted to add entropy, get a bigger dictionary. A sample one I downloaded has about 7261 unique 4-letter words, or about 16,920 5-letter words, combined it's 24,181 words. Between four and six letters there's 56,099 words.
Each of those sets will bring you up in entropy, from two quadrillion up to nine quintillion permutations. That would take the ATI 5970 about 4306184595 seconds, or 136.4 years. If you spread that out over 100 cards that would only take you 1.3 years to crack.
Maybe that's too close to call, so you can always change your password every 60 days to mitigate people with more money/time on their hands. If anyone ever wants my password that bad they should just give me the money they'd spend on cracking and i'll give them my password ;)
Each of those sets will bring you up in entropy, from two quadrillion up to nine quintillion permutations. That would take the ATI 5970 about 4306184595 seconds, or 136.4 years. If you spread that out over 100 cards that would only take you 1.3 years to crack.
Maybe that's too close to call, so you can always change your password every 60 days to mitigate people with more money/time on their hands. If anyone ever wants my password that bad they should just give me the money they'd spend on cracking and i'll give them my password ;)