Boost is the only way to go. The added pressure might reveal a weakness that currently exists in your stock setup, but that just means a rebuild with forged components and MORE boost.
If you're truly concerned, do a leak down test. They can be useful in determining the present health of your motor.
Anyway, I wouldn't let mileage stop me. Boost it and enjoy it till it stops... I had 2.5K on mine when I put my KB on it and presently has 24K and have never had a problem and I've had loads of fun!