Engine swap options for '98 Boxster

Recently I've noticed metal flakes in the oil during the last oil change on my 1998 Porsche Boxster. I also noticed little brown plastic pieces. The metal flakes might be from the timing chain or the dreaded IMS I guess.

So I'm planning for the worst. In the event I have to swap the engine, what are my options? Based off my preliminary research, it will cost as much if not more to swap in an original Boxster engine vs VW/Audi etc. engine. Plus there is possibility of adding turbo and getting more power from the latter, whereas the IMS issue would still be a concern on Porsche engines.

I have heard of K24 swaps, as well as 1.8T swaps and 07k swaps. Anyone have any experience or suggestions?