Swaybars changed my life, I'd get them straight up.
Spacers to give you extra lock cost <$50 so deff get those, makes the steering quicker too.
Coilovers are good too if your budget will allow. (BC Coilovers are good for around $1200)
Shim your stock diff up nice and tight.
500ml extra oil is handy.
Get an alignment too, ever so slight toe in on the back to help keep it predictable and slight toe out on the front to sharpen up the steering.
Tune Agent castor rods are cheap too ~$250, helps the car self steer. But I think adjustable castor rods are illegal for street use? correct me if I'm wrong.
Try and drift with brand new tyres, then you can spend more time out there and less time in the pits changing them
My car felt like two bricks connected by some playing cards before I got the cage put in it. While you wont actually damage your chassis by drifting (lol FF) some extra bracing might help tighten it up a little.
Before you do any mods though, just get out there and try it! See if you really like it first! Just give it a go