Okay I know I'm way behind on this- but I am also a border collie owner who's had a lab and could never have another lab or a jrt either!
I find a border collie energy a lot more manageable. I can deal with it better- it's more organized.
Our weekly schedule now that we're not living in a city that's got dog parks within 2 minutes is generally:
one day at daycare (10 hours for 25.00 for the day)
one day at the dog park (about 1.5 hours)
one day at agility (1 hour)
two days of walking (1 hour each walk)
The other two days I usually try to squeeze in a 20 minute walk and a new bone, or maybe a short traning session and I set the sprinkler up for him, or we do 25 minutes of frisbee, or his baby pool and fill it with cups and bowls for him to play with, or I take him in the car for an hour on errands. It's really not too bad! I find as long as I keep up with the mental energy I'm good. Granted he's not as crazy as some-but I anticipated that when I chose his litter.
We've had periods where there were 3 days when I could barely get a walk in due to work, and he survived!