80 knot check
In my fleet, we operate at a very large range of V speeds. The lowest I've had lately was 104 and the highest 144. That's a range of V1 speeds of 40 kts. It's too simplistic to try to make a "one size fits all" rule about what's considered "high speed" and what isn't.
We do use an 80 kt. crosscheck and call, (and I've picked up a few other ideas here), and it seems to work for us.
On a test flight a couple of months ago I was in the right seat. I called "80 knots" on mine, and glanced over at the Capt's and it was showing zero. He was a little slow in aborting (I know he didn't want to) so we applied the brakes around 100 knots. At the very light (empty) weight, we weren't even 3000 feet into the takeoff roll, so getting it stopped was very easy.
As was noted by others on this thread, inoperative airspeed readings may lead to other problems in the air. I'd rather keep it on the ground. An abort at 80-100 knots is no problem.