Hey guys could u assist me in choosing my first decent mountain bike. I am having a bar mitzvah soon and I am looking to spend around 700-900(at most) on a mountain bike although I may be able to get a bargain at L.L. Bean factory store(where i live) i am trying to decide between the grind and the flow. My first choice was the grind but i realized it had alivio. How much does that matter? also are there any other bikes you would reccomend?