I'm going to leave this thread to the 'big guys' - i.e. those with a 'grown up' IS.
As much as I would love to own one, nearest I'm going to get is my postcode - ironically 1SF.
Still fancy a personal plate though and SS61SFS is available. Ticks 4 boxes for me - Initials, age (well last year), postcode and my car. It's on the Christmas list!
All the best with your 'beasts'.