We don't do Cobra kits, but I certainly appreciate being included in the poll. Well I do own a Cobra and have owned quite a few different brands.
Great advice here already.
Certainly worth asking the question as it is invaluable to get owners opinions.
Look around at the different kits yourself and pick the kit that suits you the best. You can't build a cobra kit that can cater for everyones requirements and tastes. And as said previously, make sure the manufacturer is easy to deal with, provides the amount of support you require and has the documentation(both build manual & compliance) to get you to a completed vehicle.
Good luck with it.
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