Thanks HCP! I'll give it a try. I hope the password is one of the variations of the passwords I've used in the last 7 years...
Also, if you remember only using certain characters in your password, you can define a custom character set in hashcat so that it only looks for password combinations with those characters in it:
If you know your password only has the characters "abcdefgh12345", use
hashcat -m 22500 -a 3 multibit_hash.txt -1 abcdefgh12345 ?1?1?1?1?1?1?1?1
Finds an 8-character password with only the above characters in them. If you know the password is between 6 and 8 characters long, use this:
hashcat -m 22500 -a 3 multibit_hash.txt -1 abcdefgh12345 ?a?a?a?a?a?a ?a?a?a?a?a?a?a ?a?a?a?a?a?a?a?a
This tries all ASCII characters. Unfortunately there is no shorthand syntax for ranges of passwords.