Grace
If you use Canon, I'd recommend the Compact Battery Pack CP-E4. It's about $150 at B&H. I sold my Quantum turbo pack and got the Canon Battery pack as it was so much smaller and lighter. Works great.
Quantum turbo SC (super compact) is my recommendation, this unit lets me shoot for days without a recharge. The unit is less than a pound, is 5x3x1 inches and recharges in 1.5 hours. the only downside is that is costs $400. Uses the same cables as all the other Quatum batteries.