I have mostly Spohn Engineering pieces on my car, and I love the stuff.
One thing I'd strongly recommend regardless of which pieces you use: On the rear control arms, make sure you get some that have joints that are fully articulating - some sort of spherical rod ends - such that the control arm itself is able to twist
with very little resistance in addition to being able to move up and down. Using rigid arms with poly bushings (or just using poly bushings in the factory style arms) is a big mistake. Think about it. When the car is cornering and the body is trying to "lean", those control arms have to be able to twist or else something is going to bind and maybe break. The factory rubber bushings have enough give to allow the arms to twist - sort of - in most situations. Using the control arms to try to resist body roll is a bad idea - you just can't make them big enough or strong enough to do that job - that's what the springs, sway bar, and shocks are for. What you really want is for the control arms to "allow" all that motion so that the cornering loads in fact DO get managed by all the other components. The control arms have only three jobs they need to do well: control the position of the rear axle side to side, forwards and backwards, and control/prevent it from twisting forwards or backwards in the same directions that the wheels are turning.
On the rear of my 69 I'm running Spohn adjustable upper and lower control arms (with their del-sphere bushings), Spohn "Pro Touring" rear sway bar, Strange double adjustable shocks, factory springs, UMC control arm braces (because Spohn wasn't making any when I bought all my stuff), and AirLift drag bags.
On the front I've got Strange single adjustable shocks, poly bushings everywhere, factory springs, and a fat Spohn sway bar. I like the way my car feels and drives. It's not mushy at all.
Oh, and I sent my original power steering unit off to the folks and powersteering.com and had them rebuild it into a quick-ratio unit, so it looks original (because it is) but the steering response is now "quite crisp"