I contacted Apple (via online chat) about the possibility of an aftermarket SSD upgrade for the iMac 27". I was half expecting them to just reply with a straight NO answer, but got the following reply instead: Hi, my name is Smith. Welcome to Apple! Smith: How may I help you? Smith: Hello! Smith: Hope you are having a great day! You: About iMacs, since there's a 4 - 6 week wait for the SSD option, is it possible to upgrade to an SSD later if I buy the iMac now (27" model), e.g. through Apple or an authorised repair company? Smith: You would only be able to upgrade with an Apple certified technican. I do not have that costs available. Smith: AppleCare would have that information. But remember you would be replacing the drive and not just upgrading it. You: Do you know where I could find further information? You: Also if an authorised technician did the upgrade, it wouldn't void the warranty? Smith: It would not. Smith: you would need to contact AppleCare for further information. Smith: Please ring AppleCare at 0844 209 0611. Lines are open Monday-Friday 08:00-19:45 and Saturday 10:00-17:45. You: ok, thank you very much for your help =D So what do you think? An official aftermarket SSD install via Apple wouldn't void your warranty, and wouldn't require me to gut open my iMac. I might pop into an Apple Store and inquire, or just call that phone number.