Ok after many hours of reading forums and researching Practical, yet effective turbo applications I'm going with the Garret from:
Garrett Series Turbochargers
You'll notice some have the .48 and .63 turbine housing and they are avail. in 270Deg. thrust bearing and 360Deg. thrust bearing. How will these differ and which one will give me the least amount of lag with the biggest HP gain?
T34E50T27048 T3/T4E 50 trim w/ .48 A/R Turbine Housing
270deg thrust bearing
Specs
$617.00 
T34E50T36048 T3/T4E 50 trim w/ .48 A/R Turbine Housing
360deg thrust bearing
Specs
$667.00 
T34E50T27063 T3/T4E 50 trim w/ .63 A/R Turbine Housing
270deg thrust bearing
Specs
$617.00 
T34E50T36063 T3/T4E 50 trim w/ .63 A/R Turbine Housing
360deg thrust bearing