I've got the rear roll centre adjuster kit from Whiteline, works wonders on the cars stability and nervousnes (sp?) when tackling a turn.
I didn't realise they had a ALK for the Celica, I know they get rave reviews among the WRX community.
My setup if your wondering;
Tein Type HA Coil-overs
Whiteline front and rear sway bar
Whiteline front camber kit
Whiteline rear roll adjuster kit
Whiteline front strut brace
TRD 3 point rear strt brace