ok, when I first became introduced to the elise, I was under the impression that it would have a lotus engine, and it would be slightly heartbreaking to tamper with such engineering. however, now that I know that the elise is equipped with a toyota engine, I have no quams about it.
I understand if you're not mechanically inclined, but I hope no one will rule out the fact of making your own custom setup. I gaurantee you it shouldn't be 13k for a single turbo kit.
Admittedly though, I am not familiar with the engine bay and duct work on the elise. I can foresee the intercooling to be the most peculiar part about a custom setup here. Get your hands on some flow charts for some small-mid size turbos and start tinkering!
I know when I finally have an elise (years from now unfortunately) it will end up being turbocharged, and I most definately will not be looking for pre-made setups.