Apexi's are the shizzle!
HKS are tough to understand and set up... prob need a degree in maths from what i hear.
Blitz, is a dual port solenoid? You will want a 3 port i would assume.
Greddy? Pass!
Call up people that set these cars up, they will point you in right direction and will be more than happy to sell you one too!
Try AWD in perth, give them a call they recommended one to me. i cant remmeber the name of it, but it was none of those you mentioned