Haha yeah modding the car is definitely a passion! No regrets on this end! ;)
The ISF spoiler is nice, but the ISF brake set? Can't imagine that being cheap though, IMO might as well go get some Brembos or if you want to stay in with Lexus get the F-Sport brakes? They're either Brembos or StopTech (can't remember) and they're nice and blue! Definitely stand out though.
The chip you're talking about, is it the Sprint Booster one? There was a thread about it on CL and apparently it doesn't offer any real gains - you get the exact same result by just pushing the accelerator down a bit more.
Haha for my car, next up will probably be some HIDs (long overdue!) and maybe some other lighting mods (the Junack ones definitely interest me, maybe we can organise a group buy? :D ) and I'm looking at a couple of bodykits, but am a bit hesitant because I'm barely clearing some inclines when I drive (my own driveway included!) So still not sure, my car is kinda form over function atm.
Good luck with future mods and your car looks great btw!