Looks like a sound start. Just make sure the oil is relatively fresh (changed within 1000 miles).
I would also forgo the spacers for the track, I haven't had good luck with those under track conditions. Although given that your tires aren't that sticky they may hold up. Some clubs don't even allow spacers that are larger than 6mm.
The lowering springs will help lower your center of gravity and if they only have a marginally stiffer spring rate they will still match up to the OEM shocks fairly well. A lot of the aftermarket lowering springs are variable rate so it is possible that you may end up with more body roll. If I were you I would try it once without them so that you have a comparative reference.
For the sway bars the Stillen will do fine and matches up to the stock suspension a little better. Given your tires I would probably run on the low or middle setting for the rear.
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