Shouldn't matter, just get what fits. If I'm remember physics correctly the slightly larger line means it will put more gas into the keg faster but the extra 1/16" diameter shouldn't amount to a fraction of a percent. The regulator is going to release gas into the keg until it hits the set PSI anyhow.
As an aside, I got my keg setup from BeverageFactory.com and they were good to go. If I had to do it over again I would spent the extra $30 or so and upgraded the faucet to a Perlick from the get-go. The el cheapo faucet that came with it had a tendency to foam up the beer. The Perlick works a lot better.