I'd rate the DSE, Morrison, and perhaps the Alston subs as my favorites.
Some of the others I'm not that familiar with such as the 21st Century or Schwartz.
I feel the Martz sub is too light and weak torsionally for good handling. It may drive well under light loads, but if hard cornering is important, you would have to brace it, and/or tie it into a full roll cage structure. I have exchanged a few emails and forum posts with them and hope they will beef up their Pro-Touring sub. They seem like very nice people.
Most good subs (torsionally) are not much lighter than stock, I'm talking about the bare sub which on a Camaro is 110 lbs. Some weight is saved by using a rack and pinion, Aluminum or tube A arms, spindles or brakes.
As an example, a Camaro lower control arm is 11 lbs, so how much weight is there to save? Corvette aluminum arms and spindle will save weight, but steel components are going to be very close in weight to stock. Speed Tech, Global West A arms are as heavy as stock A arms, maybe even a bit more. I'm not saying you can't save weight, but only a little can be saved from the actual sub, the rest is either steering or in the spindle and brake assemblies. The stock cast iron hub and rotor plus caliper is where a lot of the weight is.
David
Here's some added info:
FIRST GEN CAMARO SUBFRAME WEIGHT additon list POWER STEERING
Bare sub 110
knuckle assys (stock single piston disc) 92
springs 22
A arms - upper 20
A arms - lower 22
Shocks 6
Ctr link and tie rods 17
Trans Crossmember 10
Sub total 299
PS box, hoses, pump, pitman 44
TOTAL 343
=============================================
FIRST GEN CAMARO SUBFRAME WEIGHT additon list MANUAL STEERING
Bare sub 110
knuckle assys (stock single piston disc) 92
springs 22
A arms - upper 20
A arms - lower 22
Shocks 6
Ctr link idler and tie rods 17
Trans Crossmember 10
Sub total 299
man steering box with pitman 16.5
TOTAL 315.5
subframe post
http://www.pro-touring.com/forum/showthread.php?t=20801