There are about 10 slings that match this profile, Matt.
I like single point slings, but they DO swing a bit when moving with your pistol.
2-points are the best, because they keep the rifle close, but aren't overly complex like 3-pointers.
3 pointers were designed to allow smooth transition, but I've found them to be nothing but cumbersome for our application.
A nice, well-adjusted 2-pointer is your best bet. Slings are one of those items that really relies on your personal preference, and so the only way to find one that works for you is to try different types.
There are also a few types of kit-mounted solutions, but I'll let Raith, et al, step up for that one.