If the goal is to run as fast as possible in a time trial type of effort, the best races statistically are run with each 200 about 3% slower than the 200 before it.
For a 2:00 race, running exactly 3% slower for each successive 200 would work out to splits of 28.68, 29.54 (58.22 at 400), 30.43 and 31.35 (61.78 second lap). So it's nearly 0.9 slower for each 200 at that level of racing. Obviously it's astronomically unlikely to run precisely 3% slower on each 200 (to the 1/100 of a second), and even if you could, you normally have to contend with wind or avoiding other runners. Furthermore, if you run these kinds of splits against competition of your same basic level, you're also guaranteed to pass a lot of people in the last 100 (most people slow down by 2 seconds or more in the last 200), so some running wide or weaving through the crowd might be in store for you. But a 3% slowdown for each 200 (or reasonably close to that, depending on weather and pack dynamics) is a pretty good estimate of ideal 800 pacing for most runners.
FWIW, if the current world record was run with a 3% slowdown on each 200, the splits would be 24.14, 24.87 (49.01), 25.62 (1:14.63) and 26.38 (1:41.01).
To sum up, if sub-2:00 is the goal, I'd shoot for a low 28 and barely under 58 and see what happens. If it's a bunched-up field, you usually only have one "move" in an 800. Don't waste it early. If it's a strung-out, time trial sort of race, you ideally have no moves - the whole thing is just a barely-controlled near-sprint that has a very gradual natural slowdown after the opening 200.