i can highly recommend scrog.. it will take you 1-3 grows to get the exact idea how to do but after that it really pays of..
i've grown out two scrogs at this point. well in the middle of the second, but point is is that this comment holds true. really figuring out the scrog method takes time. yet i can already see i'm going to yield far higher at this point this time. and i still messed it up.
next time will be better.
LST'ing at the height of your screen will help you tremendously with a perpetual scrog grow. i'm no pro, but i've learned that LST'ing about an inch below where i would put my screen during vegg until the last week or so helps incredibly. the plant already has an idea of what to do. just make it happen.
with that 1000 watter your looking at getting, a single 4x4 scrog SCREEN. yes the screen alone 4x4 should yield you a pound per plant under one 1000.
two 600watters would give you an imaculate perpetual scrog grow.
sog to me seems as if it is designed for those not willing to wait the extra time during vegg.
really, you could scrog out under two 600watters, clone off them and throw down sog next to them and actually do both at the same time.
i would think that would work at least...
just my two cents.
Edit: topping during the first week of flowering helps produce double buds. by this time your plant should be able to handle a little extra stress. maybe top half the last week in vegg, and the first week in flower top the other half.
i've topped once as a test run during the first week of flower, and it works wonderfully.