I see the OP already made a choice, but I'll post this for any others who may be looking into getting these grips.

I have both the GP1 and the GC2 on different bikes and find them to be the most comfortable grips ever. On the bike with the GC2's I almost never use the bar ends... I find the normal position perfect for everything. My hands are medium sized and I prefer the extra size and support of the large grips. So if you think you may be in between sizes, I'd say go with the large.