6.5 Sherman or 6.5 SS (Sherman Shortmag), or a .280 Sherman, or 7mm SS (Sherman Shortmag) would be a great option if you're wanting something a bit different that all your buddies aren't shooting or have never heard of. Also, Rich Sherman (the inventor) is a very active member of this forum, so if you have any questions he can help. His username is "elkaholic".
That being said, the .280 AI is a great option, and so is the 7mm RemMag pushing Berger 168 VLD's or 175 Elite Hunters.