How are things Nigel, was looking at this alot lately and was thinking the 35r might get boring very quickly. From what I understand talking to Colin in SSI, in comparison to BPU ,you will just gain marginally. But in saying that, I think the most important aspect is to have a generic setup so you can swap Turbos with minimal outlay. I am between the To4z and the 35r
Based on researh so far, for backup/support for parts and quality I would go with Paul's Kit (Whifbitz) and a Solaris S6GP unit RyanG supplies
Marty in SSI, installed a few of Pauls Kits now and is impressed with fitment/quality of components and support, the only other option I would even consider is the HKS kit but then future Support and supply of replacement parts will have a longer turnaround time. Who knows how long HKS will support the 2jz Kits
For me
I would leave the Engine as close to OEM spec, too many horror stories of build engines
Whifbitz Kit (Generic setup to allow Turbo upgrade with minimal outlay)
TO4Z or 35R Turbo
Solaris S6GP
Carbonetic Twin Clutch
Whifbitz Garett intercooler
Setrab Oil cooler 20/25 Row
OEM Bosch Fuel Pump
Fuel Rail??
Injectors?? Probably try stick to mainstream like Bosch
TRD Diff
Cams?? Titan, HKS or Whifbitz Billet
PHR Oil Pump or OEM ?? Would let Marty decide
Whifbitz Billet Pulleys
Intake Pletnum?? PHR new Pletnum seems to be getting good results but woul leave it up to Marty
I think the most important thing is the support: availabilty if you need to replace any parts; at least Paul is only over the pond so turnaround time should be minimal