$1000 to spend on suspension

[Lucky]

$1000 is a bit tight, if that includes the cost of alignment.

If you can't stretch to $1500-$2000, then about the only thing you can do for <$1000 is top-flight sways and drop-links. They will make a big difference, so don't discount this as a good starting point.

If you can stretch the budget a bit, then I'd recommend RoW M030 suspension kit + aftermarket drop links. This will cost you closer to $1500 all-in if you do your own wrenching but pay for an alignment.

Good luck...