Is there any way you could get to a store to try out the different tripods in person? That is the best way to choose, IMO, because then you can really get a feel for each tripod and how it operates as opposed to reading opinions and looking at pictures online.
What I dislike most about the 1 series Benro is not the legs, but the B0 head. If you are set on the 1 series, try find the legs without the head, then pair them with a head of your liking. The B0 really is a horrid little thing (again, IMO).
My tripod setup weighs about the same as the C2680, I believe, and I use it all the time for hiking, I don't think a slightly lighter tripod would make much difference.
If you get the 2680 from Peter's link, it only costs about $20-30 more than the 1 series you were looking at, which I consider a great deal given the difference in stability and the ballhead included in the package.
I'm not trying to push the 2 series on you btw, it is just from my experience trying out Benro tripods, that I wouldn't want anything less than the 2 series for a DSLR
I know that the b0 isn't a great ball head but I figure it is better than the boo that I was going to get, and I see the 1 series for 300 bucks and the one peter linked as 360, so if there is somewhere that you can find it for 320 I might give it a try. as far as the weight goes the 3.1 lbs that the 1 series is is already .6 lbs over the max I wanted to carry and the one peter linked would be 1.1 lbs over the target weight. I would love the 2 series just for the leg diameters but I just don't think I would carry it as often (as it is the 1 series will prolly stay home more than the tiny sirui I linked to begin with. I know that I will probably have to replace the b0 head at some point, but it should work for a little while. What I would really like to have is this.
but that is 170 bucks over budget (wish I could swing it) so for now I will go with somethign cheaper and replace the head first then get new legs (pretty sure I can smooth it over better with the girlfriend if I buy it seperatly and she doesn't catch that it will be an almost 600 buck triopd lol.