At Speck's Website, there are a number of cases for the computer, but I'm not sure which one to get. I really need a case that is thin and light and acts more as a scratch protector than a bump protector (I have a satchel-type bag as well). Do any of you have experience with Speck's line (if so, what does the "Satin" models feel like?) or do you have another brand that you like a lot?? Cheers!