If you're a beginner, CAMP's PIU 2.0 Belay Kit is a great place to start.  If you're an experienced climber, well, if you're replacing your belay device then it's probably a good time to replace that old 'biner anyway.  Save a few bucks by getting them both together!  This kit includes the Piu 2.0 belay device and Core Lock carabiner.

• Weight: 220g (7.8oz)
• Screw lock secure closure
• smooth HMS belay
• large rigging hole allows a locking carabiner to rotate all the way through