It's all about the money... The 2.5L could be fixed for less money than it'll cost to get into a Vortex V6. If you could afford it, or get it done correctly, that's my vote.
I bought my Jeep with only one this in mind. Hard top and doors. I could care less about the motor, because I figured if I blew it up, I'd put the same V6 inside. But I'm building around the engine I've got, because if I ever do blow it up I want to be sure the rest of the drivetrain can handle it.
You need to make sure your addressing that too.