Detroit speed is the best of the best. They win every single event that they attend... by a lot. Their test cars have seen 10's of thousands of miles on the street and track. The geometry, quality, customer service, and components from them are the best in the industry. It is a lot of money, but you get what you pay for.
The Art Morrison piece is also very nice. It is close behind the DSE frame for close to the same money. One thing about the Morrison frame that I do not like is (correct me if i'm wrong) that in the Corvette control arms, they retain the stock soft rubber bushings while detroit speed utilizes delrin (no deflection).
The Speedtech subframe is also a good choice for certain applications and their nova has seen quite a bit of track time recently. It's best (and worst) feature is that it allows you to use suspension components you may have already bought before you decided to go aftermarket. This feature comes at a big cost. The speedtech subframe, unlike the DSE and AME, has the same geometry as a modded stock subframe. They restricted themselves to utilizing stock spindles, stock pickup points and control arm lengths with exception to the "built in g-mod", which costs $18 on a stock sub. There is a lot of variables in an independent suspension, and these restrictions require that sacrifices be made somewhere. The Speedtech subframe is the "best" bang for your buck, but that is because it is based on a stock subframe, which really is the best for the money. I'm not trying to brainlessly bash speedtech, because they are a good company, with good products and service, it's just that too many people falsely think they are getting all the offerings of an aftermarket sub, for much less money.
I know you didn't mention this in your original posting, but it is a valid option so I thought I would point it out.
Jakes Rod Shop sell a bolt in subframe that has scratch designed geometry, c6 spindles, and high quality custom valved bilstien coil overs. His cars are also tracked on a regular basis and is very competitive. He runs right behind DSE cars with about 150hp less. Good components, good track record, and at $6000 it's priced slightly lower than the DSE and AME pieces.
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Ken
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