It is always better to outgrow a quad then to be unable to handle the it.
I would check out the DRR lineup
DRR ATVS KIDS ATVS
They have a DRX50,DRX70 and DRX90 for 2007.
Their features and quality are superior to any of the other minis out there...yes even the Japanese built quads while having a lower cost
DRX50 has won the National Championship for the 4-6 stk class the last 3 years..... $1,999 MSRP
DRX50 comes 41" wide, dual a-arms, 4 whee disc brakes, performance exhaust and engine...The 70 and 90cc are now stock at 44" wide
When we brings ours out and new people see the quad they immediatelt stop in there tracks and ask "what is that" and then "How do we get one"
Check out this link on the bottom left of this page to see a video of an 06 DRX50 in action
ATV Ride Test - DRR's DRX50 - A race worthy mini ATV for less than two grand
They are not made in China....Taiwan built....Great bikes and even better people at DRR
I am a Honda man for adult quads, but DRR offers the best value/perfomance in the youth quad market.