Largest and/or Best Pizza in Las Vegas (Preferably both!)

Hello!

I'm planning an LV wedding from the comfort of nice and chilly Michigan and have found the forums to be a lot of help in researching food options. My parents want to do a buffet but, after a recent experience here in Grand Rapids, my fiancee has decided that he wants pizza. Specifically, the largest pizza LV has to offer. Now, I'm a bit more pragmatic (and I know how picky he is), so I'm looking for the cross section of both largest and tastiest. We're looking at a guest list of 30-50 people, so some place that can accommodate everyone would be great as well - but don't let that stop you from suggesting the great hole-in-the-wall places too! We're trying to find a site that will let us do the ceremony and reception at the same place, so, theoretically, we could have it delivered/picked up as well.

Thanks in advance for your help.

(I know there are a lot of threads about pizza in LV, but as far as I could tell, no one was talking about size. If I missed it, please let me know!)