Both my kids have the diamond razor edge. Comes in a 15 to 29# and 30 to 60#. I have one of each, both great bows. If you get the lower weight model, you can send it to bowtech and get the 30 to 60 limbs for a charge of about $50. Nuclear ice is a good bow, but I think a 9 year old would out grow it in a year or two.
Bowtech Sniper 55lb 29" draw
Easton ST Excell 400 with blazers, 100 grain field point
True ball fire ball release, Octane 7" stabilizer, hostage capture rest, Spot Hogg Hunter sight