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Help with mash tun size

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I'm in the process of setting up a HERMs system and need help determine what size mash tun would be best.  I'm looking at a kettle that is either 12.75 (10-15 Gal) or 15.75 inches (20 Gal) in diameter.  I like to brew both 5 and 10 gallon batches so I'll be using any where from 8 lbs of grain on up.  I'm not sure how to calculate what the grain bed depth would be. I'm concerned that if I go with the larger kettle I will have problems with some smaller beers, or if I go with a smaller kettle bigger beers will be an issue.  Any help/suggestions is greatly appreciated!

mtnrockhopper:
The "Can I Mash It?" calculator here will help you determine what size beers will fit in each. My 10gallon mash tun will fit ~21lbs grain with 1.5qts water/lb.

http://www.rackers.org/calcs.shtml

About grain bed depth, if you have some grain, Measure a gallon of grain and weight it to get gallons/lb.  My guess is around 6lb per gallon based on some buckets of grain at home.

The volume of those kettles is pi*radius^2 per vertical inch (in cubic inches) - or -

Small: 6.375^2 * 3.1415 = 127.67 cubic inches = 0.55 gallons/inch
Large: 7.875^2 * 3.1415 = 194.82 cubic inches = 0.84 gallons/inch