Thats right, an easier ratio is that the rears should be 2/3's of the front for a neutral handling car.
Swaybars don't add to the compression rate of the spring as such, the percentage given is the increase in roll stiffness over the stock sway bar.
The reason that Tsuchyias car ran such stiff springs at the rear is probably because of running wider rims/tyres at the rear than the front, meaning that he could still have plenty of grip as if running less track and tyre width with a softer spring. He would also be running high grip tyres, probably his usual Potenza RE01R. This is just a guess but from reading the trueno bible, it seems that pretty much everyone goes for a softer rear spring rate when compared to the front usually by the previously stated 2/3's ratio. Thats my thoughts on his setup anyway.
TRD shocks are almost identical to KYB AGX's (adjustable) that suit 86's so they would be the go id say, around a 1000 a set.
Ive got a 18mm rear whiteline bar in my car with 8 and 6kg springs and put in a adjustable 24mm whiteline front yesterday and set on 2 of 4 stiffness, it feels really good, i had it on 1 but didnt think it was quite enough so increased it to 2 and now the car feels great, if not a little oversteery which is the effect i was after anyway.
Personally id just buy whiteline swaybars, as they are good quality and much easier to get than TRD im guessing, at a cheaper price also?