understanding turbo specs

[Hu_Dat?]

Hey y'all, I always wanted to know what these specs ment.
If someone could also tell me what the average #'s (yes I know that avg depends on what ur using it for, so lets just say average for a daily driven turbo app) were for each spec I'd appreciate that greatly.

http://www.hksusa.com/products/?id=818 - on this one why is the ball bearing almost twice the price

heres another one

http://www.hksusa.com/products/?id=817 -


The only thing I kind of understand is the PS output (its the max potential power output right?). I have seen ps before in english mags how does it relate to hp exactly? i would really like to know

two last questions. In your opinion which is better, two small and equal turbos or a small and big sequential set up. what would be good spec #s for the "twins" and the small and big seq. thank ya lots

Love peace and chicken grease

[454Casull]

PS is roughly the same as HP (1.01 times greater, IIRC).