Nicole

A vertical washer will be indespensible for your work,
I agree with Ralph , an Omega 4x5 enlarger is an excellent choice.
A good water panel for tempature control
You can make a good sink out of wood if required
A nice set of 20x24 trays x6 will allow you to do a very good process
a good sterio for the darkroom
Build a drop table for your enlarger( I can send you the plans for one that works with a omega enlarger once you decide on your direction)
Room for a second light source for flashing, solarization ect.
Home depot can supply most of the goods for print drying.

I know this is a lot of stuff, but if you plan on printing for a long time these items will help.