considering there are no behavioral issues with him its really all a matter of what you think is best. did the parents have issues? if the father or mother had issues then your likly to have that chance of problems no matter if he were nueterd or not.
benefits of neutering: increased life span, happier dog, easier to handle dog,no prostate problems
IF this weer my own dog i would deffinatly opt to have th neutering done and start out early with a healthy diet and regular vet vists and no rough housing along with a fish oil and glucosamine supplemnet everyday.
also i would invest in a pool or find a nearby lake or pond and do regular excersize routine in the water that really helps to build up muscle without the dangers of wearing on the joints.