Why 1000 and not 1200? Just because it's a rounder number?
Both 1000 and 1200 are mental numbers. 1000$ because it's a strong psychological barrier, a lot of people get scared when we get near there, as you can see it's correcting a bit right now, not a bad thing, let the price accommodate.
1200 is the ATH, so another psychological barrier. I think there will be a dip, smart people will buy it, dumb people will miss it and once we get past the ATH+ for good they will be left with no bitcoins to hold.