Can't reinstall Mac OS

Hi there
I am having a major nightmare that is just getting worse. I am an experienced Windows user and made the jump to Mac with a 27 iMac w/ 3TB Fusion Drive. A faulty RAM issue damaged my Mac OS X partition to the point that even the repair in DU cannot fix it. Ironically, the Bootcamp partition worked fine. After recovering the files I needed (by installing OS X on an external HDD and booting from that), I have decided to reinstall OS X. However, I have encountered more problems!
Within DU (boot and OS X version), I cannot erase the corrupted Macintosh HD partition. I can create a new partition, but it doesn't seem to save it once I leave that screen. When I go to 'Reinstall Mac OS X', the only drive I can install to is 'Recovery HD' which is locked. I appreciate that Apple should be sorting this out, but I work 6 days a week and would rather sort it myself if I can. I should note that I have since erased the Boot Camp partition so I can see empty space, but can't use it!
Please can someone help? I am happy to provide any more information should it be required
I have added a screenshot below to show what I mean...
Message was edited by: mdc92

What you need for Mavericks, OS X 10.9: Apple Support Communities
See if this helps be sure to pay special attention to the External Drive section.
And a special thanks to a brody.

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