Specifically, protection. If you had the choice, which would you get? Vyper M or MacCase Sling Keyboard protector? iSkin or Lajo? I can get a Lajo for about $12 so I'm definitely leaning toward that. Should I get a Radtech screen protector? Would you get a keyboard protector or a screen protector? or just get both? geeze, I'm glad I already bought an invisible shield for my future nano.. I really should have calculated this extra stuff into my budget. $200 for a external hard drive, $1300 for a powerbook.. $150~ for a nano soon, and hopefully under $100 for other accessories. also, here's a bit of a random question -- how can you tell which revision your pwoerbook is?