Well room isn't an issue, so should I get a 10-20gal tank? How long/how many tires would one of those fill?

 

well i have a 3.5 gal tank matched with a york 210. i can fill 1 tire completely from 5 psi to 25 psi and then be able to add air to another tire. dont get too big of a tank or your pump will never be able to keep up and it will always run.

-cutts-

 

I'm happy with my 5 gallon tank. Enough to do the all eight lug nuts and it'll refill by the time I'm to the next wheel. I don't know how fast your compressor would pump in comparison to the york ac compressor though.