Sounds like the position that I was in a couple years ago. STechnic did my build and ASG the tuning. Can't actually remember the exact pricing as I kept adding to my list!

You'd probably be looking at around 7-8k for a new bottom end with water pump, oil pump and new gaskets etc

Add 1-2k if you are looking to open up the heads for some cams and slight headwork (makes a bit of difference to your midrange)

With a VF34 and PW TMIC, it made a comfortable ~290ish hp, and it hasn't been given an easy life since, but without much drama apart from fuel surge when the tank is low.

It's a tough decision though. You can spend the money to put the car how you want it, or you can go the cheap fix, sell and buy something else. Whilst sometimes it may be smarter to sell, once you're attached to a car it becomes a matter of love