The best virus removal tool generally depends on what infection you have - some are better at removing specific types than others, and there is a wide mixture. If you post up the DDS logs, we can take a detailed look at your computer for any remaining virus issues.
In general terms, MBAM is a great tool - but you've already run that one. Most likely there will just be a couple of extra settings that need to be fixed which won't usually be picked up by a malware tool. Fortunately SweetPack is fairly simple to remove, and you've more than likely already taken out the bulk of the program.