Turbonetics Choices?

[wa-fu]

Alright, I am sick of searching here and in FA. I am trying to decide on a turbo and need some answers (please help). First, do I need a standard shaft or a big shaft (for the turbine wheel I mean). Second, is "Tuff Turbo" option worth it? Third, what's the difference between N, O, P, and Q Trim? Finally, what's the difference between Dynamic and Carbon seal?
I have a 97 and will be turbocharging the KA. I have a Walbro 255 L/H high pressure fuel pump for S14, MSD 50 LB/HR injectors, JWT fuel rail, 93 Cobra MAF, will get JWT reprogramed ECU and maybe a S-AFC, will probably use a RH manifold with a ceramic ball bearing on-center TO4E 50 trim compressor and .69 A/R, I have a HKS SS BOV which will be recirculating, Tial 35mm wastegate, Greddy Profec B boost controller, Greddy Turbo Timer, etc, etc. Still need to decide on an intercooler.
My goal is at least 300rwhp and 300 ft/pd torque. Thanks for any info or advice.