Well, the manual rack is 4 turns lock to lock. The power is 2.25.
I find that with 4 turns that I have to do a lot of "steering" - not sure what other way to put it. I'm also afraid that if I got it crossed up on the highway I'd be in trouble - I'd have to do a lot of sawing of the wheel to save it. Bear in mind this is a street car only. I've also found that to run the caster I want to run, the steering gets pretty heavy and jarring.
With power steering (especially with the Heidts adjustable valve), I should be able to dial in how heavy my steering is, and crank up the caster as much as possible (caster is desirable).