I am a huge fan of Flemming Rasmussen. He is a fanastic producer and a genius. Look at the albums he has under the belt so really any of the 3 Metallica albums he produced (RTL, MOP, AJFA). I went with RTL in the end because that was my first album. I like Kill Em All A LOT but I think its overrated by metalheads. Mustaine is a better soloist but its a bit sloppy, the production is spotchy, the playing is not as tight as it is in RTL and on. Its very adolescent in nature, but still very good.