Picking Plants

So i germinated the 10 seeds i had and am ready to start them off under my 1000Watt MH and start feeding them nutrients, but my problem is I am only able to keep 4 of them (space + legallity) so i want to keep the ones that will yield me the most as where im from its done on how many plants u have, not the weight.

How do i tell in the early vegitative stage which plants r likely to yield me the most? What r the tell-tale signs?

The ones that grew the fastest and are the biggest at the moment, also you can never know unless you clone them bud the clones then find out witch ones the best.

So as a general rule - the better they Veg = the better they bloom?

Look for the shortest, stoutest, widest plants, with thick stems, good side branching, and short spaces between the nodes.
It's the best you can do to tell a female but it's still a guess, just a little more calculated.

Compare them, you will see wich ones look better.