Dying Main Bearing, Recommended Engine Swap?

[WHATSaDavid]

So my 1.5l 06 Yaris a few years back started making this whirling noise. It was quiet at first and everyone I talked to though it was the water pump. So I continued driving it and overtime the sound got louder so I finally put the time aside in the summer and did the WP. Turns out it wasn't that so I by passed the AC and it was still making the noise, so last thing I can guess is its a main bearing because it changes with the rpm.

I took it to a shop and they quoted me for essentially a rebuild because "we'll have the engine taken down so you might as well do everything else at the same time." Now I'm thinking since I drove it for so long I probably buggered the crank and put heat in the block so I might as well just get a new engine.

So I'm wondering what engine I should look into getting. I read of some people doing newer 2012 engines and I'm hoping for a straight forward swap, not a bunch of adapting and new ecu/dyno.

Also yes the dream is a Corolla swap but I don't have the money for all the extra adapting nor the time since this is my daily.