Four keg capacity was what I was looking for also. I have a 4x manifold, but presently have just 3 kegs......soon to expand on that
7 cu ft seems to be the breakpoint for 4 kegs, but I went slightly larger as Lowes had knocked 120 bucks off of this model. I was able to cram it into my SUV so I didn't have to pay for delivery.
Only dicey part was the height as I don't have a collar on it obviously....it just does clear the kegs with lines attached.