After a bunch of research when I made my purchase and after reflecting a bit, I think your decision should be driven by what your plans are and what you're willing to spend for that goal. If your plan is strictly aesthetic, you should be fine with any set of c/o's unless there is a specific avant model. If you plan serious track time, the real expensive set ups (e.g., Stasis ms kit) will allow you the ability to play with height and spring rates.
Assuming you're more in the former department, check out the Vogtland GT kit from Startup. The kit was actually based/tested on Startup's B5 S4 avant. You may also want to shoot them an email for their feedback. Either way, suspension was one of those mods that made a huge difference (akin to the "chip").
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