Mountain Bike Accessories?
So I just sold some things and got a little extra money and I want to use some of the money to upgrade my dads new mountain bike. He built it himself, starting with a really nice lightspeed frame. He's really into carbon fiber stuff, and he wants to make his bike light. He isn't a "mountain biker" per say, he just rides it from fishing hole to fishing hole, but he's been really good to me over the years and I'd like to do something nice for him. He's 65 so he's not a young guy by any means.
I have around $300 to spend, but that doesn't mean i need to spend all of it.
I thought about maybe a set of disk breaks, or a carbon fiber fork/seat post/handlebars.
So, forum, any suggestions? And if you could lead me to good websites that'd be awesome too.