Hi Sean,
I'm no probate expert, but I'm guessing you shouldn't wait a few months if you really want to get this house under contract.
If you get an appraisal, YOU will pay about $400, but EVERYONE involved with this property stands to get some benefit from it. They might not even thank you.
I suggest you take some pictures, as you mentioned, and pull the comps. The comps will probably let you estimate the ARV of the property, as well as what physically distressed property in the neighborhood has been selling for.
DISCLOSURE: I have NEVER looked into, much less closed, any probate deals. This is just my 2 cents. :)