I hope you know that you just started spending money...
Lot of other toys to go with a mill.
Ok, your list.. the stuff I have I checked off, got a ways to go yet though.
Log arch
Planer XX I've got two of these now, just picked up a 16" JET, have had a Delta bench model for years.
firewood shed
Lumber shed
cant hooks X
Chain saws. XXX Got 3 of these, unless you count my "chainsaw on a stick" then I have 4
Splitting malls X
de-barkers
band setter
band sharpener OH I want this one BAD!!
logging tape ??
over head crane to roll logs. That's what my cant hook is for right? I also have the "hook" from a cant hook I can hook a chain to and use my tractor with on the biggons.
wood working shop. XX
wood working tools XX
tree felling wedges XX
moisture meter XX
metal detector XX
electric motor for carriage lift... I wish! Got a nice hand crank though! ;-)
Blade welder
And you forgot the most important one. A tractor with loader/grapple/forks, without this one there is no reason for a sawmill!