Bore m103 2.6 or replace with m103 3.0?

[eliburch]

Hi, First post here so go easy on me.

I am planning a 190e turbo build for a new project. I am new to the Mercedes world but learning lots on peachparts!

Okay so my question, if I have a 190e 2.6 with about 150k miles would you rather replace it with a 3.0 also with about 150k miles or bore it to around 3.2L? My 2 main goals here are low cost and reliability, not necessarily maximum horsepower.

I am leaning towards boring it out because i could basically rebuild the engine at the same time but my concern is I would need custom pistons for like $1200 whereas I could just pull a 3.0 motor out of a junked car for much less. Are there any off-the-shelf pistons that I could use? The displacement doesn't need to be exactly 3.2. Could be 3.3 or 3.4.

There are really good machine shops near me so I'm not worried about that. Just thought I would get all of your input before contacting them because they'll probably just try to build me custom pistons.

I looked for other threads on this but didn't see any so you could point me that direction if I missed anything.