No problem. That's one of the reasons I became a TA, there are only so many times I can price and book my own vacation...
Anyways, here are the numbers. I ran your dates for a Garden Room at the CR. I wasn't sure how many park days or if you would originally have park hopper but since free dining will probably require park hopper I added it. The following numbers include your dates, 6 day ticket + park hopper and the regular dining plan. Here are some numbers.
Free Dining = $6,345.60 + dining plan tax $140 (estimate) = $6,485.60
30% room discount = $6,259.46
30% room discount without park hoppers = $5,965.54
25% room discount = $6,486.14
25% room discount without park hoppers = $6,192.22
So assuming a 30% discount is offered for Garden View rooms your savings over free dining would be $226.14. Without park hopper the savings would be $520.06. If only a 25% discount is offered and you want park hopper then its basically even, whether you take free dining or room discount. If you don't want park hoppers then the 25% would still save you $293.38.
Generally a 30% discount is offered at Deluxes. But I just threw 25% out there in case they include any surprises.
Also, if you want the deluxe dining your savings would change, the prices above will just go up.