Suspension Plan, for suspension noob Options

[CilverSeliST205]

I am quite a suspension noob so please bear with me,
If you had $1500 to invest into suspension components what would you get assuming:
you got, rims and tires your happy with and not planning on replacing
your not planning on getting any kind of expensive coilovers (just yet)
lots of oem parts in your suspension that are wearable need replacement.
You also have tein ss spring that you can stay with or change for better.
Only mild brake upgrades if any (no bbk etc.)
Your ride got ~280whp

So basically what brand/specs:
sway bars
strut bars
frame brace/arm bar (does this mod have any NOTICEABLE impact??)
dampers/springs
brake pads
anything else

also what other components would you upgrade or replace (because they might be worn out)

Thanks!

[Sinyk]

are those suspension techniques sway bars much better, or a noticeable improvement, over the stock GT-S sway bars?