If you want to keep your existing subframe,
I would say go ridetech strong arms, tall spindles and their tru turn system.
That way you can keep your power steering box, and get all the benefits of lower ride height, and corrected geometry.
The ridetech 48 hour camaro uses this setup and does fairly well at autocross and in reality will be fine for road use.
Next level up, I would say get a complete DSE subframe with rack and pinion steering. It will give you all of the above in terms of handling performance, but will be lighter than the stock subframe so you may gain speed performance and poise.
With regards to which subframe, DSE, Speedtech, Art morrison etc, thats your choice based on cost, strength, weight, completeness as a total package. There isnt a great deal in it in term of what you will feel when you drive the car
Next level again would be to combine an uprated subframe or custom chassis with upgrade to corvette c5/c6 spindles and uprated hubs which again are lighter than stock spindles. This it what I have gone for in my project, but probably over kill for most people
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