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For downwind work the spi is critical. I would be happy with any good "upwind" main while going downwind.
For upwind, I have had good results mixing different sails. The best jib we ever used on the Tornado was from Landenberger (normal luff length). This fitted well with our homemade/FCA main. The interactino between selftacking jib and mainsail is not critical (yet) in my opinion, unless you are optimizing your sails and rig for a special event with known weather conditions. Even then the best of the best make the wrong calls sometimes. Like going to China with special sails for light winds.. I guess what I am trying to say is that the performance gain available is so small that it is not worth investing time and money there unless you are very, very skilled in the full game.