I have to agree. A swap is a huge undertaking as one can witness from the really fabulous swaps undertaken by a number of our members.
They take a lot of time, ingenuity, fabrication, modification and money. The more you have to get done by others the more money it takes.
I have two Xs, I hope to change one to a Toyota 2ZZ powerplant and the other to be a warmed up version of the existing using standard approaches which will net a notable improvement in the car but nothing like a swap would.
We also own a first generation Miata which although not powerful, has a much easier time of it in normal driving. I am hoping to match that with a hopped up Fiat motor in the ballpark of 110hp with fuel injection using one of the squirt engine management systems, higher compression pistons, EU exhaust manifold, a massaged head and DCNF throttle bodies.
Time will tell, like many here, I have too many projects.