I am stalled at the moment trying to get more/better information for the high speed counter from Micrel. They are not responding to my requests so assume they are not interested in little fish.
I do have a plan B but once again I am waiting on the distributor to reply but as I only fired the requests off over the weekend I am not expecting anything for a few days yet.
The link in my first post shows it being done (in a different way) using a PIC microcontroller and if all else fails I may build that instead but I prefer to 'roll my own' with less limitations / better features.