Father/Son project? Opinions welcome........

[BRAD]

go with the extended cab.  and that little bit of extra weight wont make a difference with a motor thats going to be pushing near 500hp.

[Colorado700R]

<I'm up for adoption>

~Brian

You and the rest of the Garbage Pail kids 

[Peelz]

I vote reg cab. Cheaper, easier to maintain, lower insurance. Less to break...it is a GM. Sorry, personal experience talking. Less people in the truck if he wrecks again.....
Sounds like a lucky kid.

[Warren]

i would say ext. cab. for the reason you said. more room for subs and amps. and if you are in the market for a 12" sub and a 2000 watt amp. i have some stuff i could sell you.