um, power steering is standard on all R31's.
Yes, they can go hard.
If you like manuals, then don't even bother with a Ti, because they only came out as autos.
They are easy to modify, and you get good power gains with minimal mods.
Ti and Silhouette both have factory mags and trip computers, and they are pretty good as far as fuel consumption goes.
Standard, you should average 450-500k's per tank.
I could go on all day, for more info, click the banner in my sig.