Bitcoin-qt encrypted walltet password cracker

Hi. I mistakenly encrypted my bitcoin wallet over 12 months ago and Iv forgotten the password. Iv tried a basic rubi scripts to brute force but after a day or of running it was going at about 1 guess every 15 seconds I need a program developed where it will utilise the GPU to guess rather then the cpu, also to be able to pause & resume without having to start all over gain from the start. Having options like, beat guess, characters to try & how many mistakes. More cane be discussed, but anyone applying must be 100% familar with bitcoins