Did you know that 2011 iMacs have space for an extra 2.5″ HD?

iMacApparently, apple offered optional SSDs at the time of purchase, but the space and sata ports are available in all 2011 iMacs.  You will need some custom cables and a bracket (or double stick tape) to complete the install.  It is also a pain in the ass (requires a full Logic Board removal) to run the cable to the board.  Not recommended for novices, but its incredibly cool to have both the speed of SSD and the capacity of a mechanical drive, all inside the iMac.