I switched from an Atlas CAL to an MDT Ckye Pod. Way more versatility and easier to deploy. The problems you run into are just the extra weight of carrying the bipod. However there are some systems where you don't need to keep the bipod attached to the rifle, I think the Spartan system is one of them.
If you're looking to keep the bipod attached to the rifle then it depends on your mounting system and the weight you're willing to carry I suppose.
$125 -> Harris with lever installed (look it up on Short Action Precision's site)
sling stud compatible
$200 -> MDT Grnd-Pod (only picatinny/ARCA attachment)
$450 -> TBAC bipod (mainly picatinny rail attachment)
$600+ -> MDT Ckye Pod (picatinny/ARCA/sling swivel compatible if you go with the lightweight version)
If you're looking for a system where you carry the bipod in/on your pack and attach it at the last second, I'm way out of my depth and think
@Happy Antelope is the guy to talk to.