What size MLT?

Ok, I am going to switch from a cooler to a ketle with false bottom for a MLT. Looking at the Blichhman boilermaker kettle as it has everything besides the false bottom and their false bottom got great reviews. I do 5 gallon batches and dont plan on going to 10 gallon. I like to brew big beers, such as barley wines, etc., so would a 10 gallon MLT be ok for up to 25 pounds of grain or should I go with a 15 gallon MLT?

Using this calculator,

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

At 1.25/# your looking at 9.81 gallons needed for 25 pounds. Thats really close for a 10 gallon MLT with a false bottom. Go as big as you can afford. If you can swing the 15 do it. You won't regret it.

Check here: https://www.homebrewtalk.com/f11/how-big-your-mash-tun-needs-123585/.

I mash in a keg and can comfortably fit 22-23 lbs of grain. My largest grain bill was 24.5 lbs.