I'm planning on picking up a full Rival group to replace my DA 9/8 speed group. I'm ordering through QBP at a friend's shop and can have the option of swapping parts in/out from other SRAM groups.

What would be the best thing to upgrade in the Rival group? I was thinking of getting Force shifters and Rival everything else? Or maybe Force RD + FD and Rival everything else? I'm trying to do a keep cost as low as possible/bang-for-buck type thing.

Thanks!