I'll let you guy's fight over the math, but here's the deal in my area.(It will vary depending on your location. I have a medium size constuction co and we pour a lot of concrete.
Over 3 yds-$78.00 yard+tax-no delivery charge if under 1 hour pour.
Labor(this is what my subs charge)0-15 yds slab pour=$500 for trowel finish/$650 for trowel/machine finish
I would highly recommend a machine finish/sealed if you are going to be spilling any thing on it.
As far as wire & control joints, we've been pouring with fibermesh additive here in New England for 20 years and the only cracks we've had came from pouring over unstable soil. Put down 2" of 3/4 stone and compact and you won't have any problems. Wire mesh isn't for preventing cracks, it's for holding concrete together if it does crack.
[color:blue]MCA Gold card judge 67-68 Shelby
Certified judge 65-70 Shelby, 67-68 Mustang[/color]