Fare finding tool - which routes to monitor?

Hello all,
I'm working on a new utility for the V-Flyer Toolbox that will help you locate the cheapest fares in each cabin, however because of the volume of data involved, I have to limit it to a select number of routes.
So, over to you. Which routes would you like to have monitored? Which are the most popular, and which (potentially) fluctuate so much they're crying out for a tool of this kind? It's route-based, rather than flight - so I can get all the LHR-JFK flights in one hit, rather than having to specify VS009, 45, etc.
Pete
Edit: I'll add a poll to tally the votes. LHR-JFK, LHR-SFO, LHR-LAX, LGW-MCO & MAN-MCO are all on the list already, so this would just be for any additional ones that shouldn't be overlooked
I'm working on a new utility for the V-Flyer Toolbox that will help you locate the cheapest fares in each cabin, however because of the volume of data involved, I have to limit it to a select number of routes.
So, over to you. Which routes would you like to have monitored? Which are the most popular, and which (potentially) fluctuate so much they're crying out for a tool of this kind? It's route-based, rather than flight - so I can get all the LHR-JFK flights in one hit, rather than having to specify VS009, 45, etc.
Pete
Edit: I'll add a poll to tally the votes. LHR-JFK, LHR-SFO, LHR-LAX, LGW-MCO & MAN-MCO are all on the list already, so this would just be for any additional ones that shouldn't be overlooked