Replace or rebuild ISX in Canada

I've got an ISX 2250 that has a dropped liner/head issue. Pressurizing my coolant pretty bad to a point where I blew a couple hoses over the last week.
Looking at inframe but also considering a reconditioned motor. My current motor has about 650,000 Km but lots of idle time. It had d-lete done before I bought it (probably at about 400,000).
The reason I'm not sure which way to go is I also have a front structure and a rear structure leak. Fuel pump is original from what I can tell and injectors are original.
Would it be cheaper to just pull it and replace it? Especially with doing the structure leaks also. Can you buy recon motors without the egr?
And approx what would be an average price to rebuild a isx15 2250 vs new? I'm hearing early estimates of $40,000 CAD to rebuild.

 

I'm not sure if the pump has been replaced or rebuilt. I know there are issues with that model pump that I'd like to avoid after doing an inframe. Don't really want to do the motor only to have the FP detonate and take out the engine.

 

Good used is an option too. I'm going to go talk with my mechanic shop on Monday to decide.
Work is a little slow right now so the downtime isnt a problem. I just want the best option for my buck.

 

That's what I was thinking too. If I get the complete reman it'll have the EGR intact. So I'm paying for something that I don't want. And while it would be nice to have an engine with warranty...the warranty would be gone after pulling the EGR anyway.
That's why I haven't talked to the Cummins shop about in-frame...they probably wouldn't touch it unless putting it back to stock condition.