Re: Need some gear help. SLing and Rear bag
It's been my experience that the TAB Gear sling, TIS Sling, and Turner Saddlery slings will all work pretty much the same and be quite effective. This is after having handled the TAB Gear sling, owning four TIS slings, a Turner, and now using the Mountain Shooter Sling. The deciding factor in how well a sling works for you is how often you work with the sling and find out which positions work for you and what adjustments need to be made for different positions. I've been to matches where there were quite a few $80 carrying straps on the firing line. When it came time to sling up, shooters would try to wrap the sling up in a hasty sling instead of creating a proper loop that would've yielded much better results.
Rear bags are also something of a personal preference for many shooters, some guys like smaller rear bags, some like pillows. I've been using a Red Tac Gear rear bag for sometime now and have found it to be a great rear bag for a variety of situations. That being said I've also seen guys using toiletry bags filled with airsoft beads quite effectively.
In my mind it's pretty hard to screw up going with a TAB Gear sling, TIS Slip Cuff Sling, TAB Gear rear bag, or a Red Tac rear bag. Those would be the options I would go with and they'll serve you very well.
