i suggest bestskinsever.com much cheaper than invisibleshield. i had one for my macbook. it was nicely made and relatively inexpensive.
you don't have to worry about accidental spills/splashes.
proper ventilation is not a concern.
i would NOT recommend applepeelz. it took me roughly 3 weeks to get some of the pieces, but never got all the pieces after about 4-5 weeks. i finally tracked down their phone number via paypal records, and bugged them. To their credit, they did give me a full refund.