Looking for some advice or pics on XD Monster Rims

I am looking at the 18X9 and the 20X10 Monster black rims for my F 250

I can the the 18X9 rims with 325/65/18 BF all terrain KO tires

Not sure what tire the 20X10 rim would need?

I only have a 3 inch lift on my front and 4 inch blocks in the rear

Will the 18X9's fit with the 325's?

I spoke to Rough Country and they told me they could sell me new front leaf springs to give me 6 inches in the front and leave the 4 inch blocks in the rear to level it out

Any input on the XD monster rims or pics would be great before I drop some major money and is the new leaf springs worth $391 including bushings and a new pitman arm.