definitely +1 on the sway bar. and 80 bucks isnt bad..you gotta remember its a name brand one. i paid 90$ for mine (20mm) brand new, straight from subaru. no shipping either cus it was delivered to my dads shop
if you do endlinks on the other hand...i personally went with perrin spherical bearing endlinks which were 180$ (double the price of the sway bar! :O )
its definitely recommended to replace/upgrade the endlinks with the sway bar, and i believe perrin is the only one that makes spherical bearing endlinks. when i did my research it seemed like they were the only ones that really made the most difference. even though its probably negligible to human feel, i went for em anyway.
also, im riding on KYB AGX adjustable struts with H&R sport springs. i havent measured actual values, however the advertised drop is 1.5" front 1.4" rear. and honestly, i think my car sits perfect. i romp my car in the snow, and have NEVER gotten stuck (aside from slightly sliding into a ditch but that was because i was going to do a 3 point turn and started off the shoulder and didnt know there was a ditch cus of the snow. didnt slam it, just kinda slowly slid in lol) i LOVE looking at how she sits. and its definitely that much better with 17s and some nice 225s
edit: dont settle for the 17mm. get the 20. idk what the actual difference is in performance, but i know my car has IMMACULATE handling in the snow, and i can drift that pig like a ****in boss with a lil bit of pow pow. granted my struts and springs probably help this too, but oversteer is most directly effected by your sway bar