I agree with Kevin. Given Mike's taste,those two albums are essential. I like Unruly Child the best myself,but I prefer an album with a few heavier tracks. However,having said that I think Mark's best vocal performance is without a doubt on the Signal album. I reckon buy Signal first and see what you think. It's easy to get now too on reissue,so buy,buy,buy!. I spent months tracking down a copy of the original to get mine! Worth every second.