Another good reason to have treatment while your tumor is small/med and no bigger than 2cm is there is a greater risk to damage to the facial nerve. Now having said this, there are people with large tumors, who have had surgical treatment with no facial nerve trauma. The doctors at the last symposium (you can order the cd's of the informative sessions from ANA website) feel there's increased risk with damage to the facial nerve when tumors are greater than 2cm.
If you are not having facial nerve issues now, and feel wait and watch is the way to go for a while, certainly do this as maybe your tumor will stop growing. I for one, would do all my research on treatments and talk to multiple doctors before hand, do the wait and watch for as long as you can and then when the facial nerve is involved, choose your treatment.
My doctor suspected I had a brain tumor in 1991, but ordered the wrong MRI (no contrast) and for 12 years life went on with all sorts of weird issues popping up and increasing. It was in 2004 I was finally diagnosed due to hearing loss and in 2005 I had surgery. My tumor was medium, did alot of bone damage as it grew, but my facial nerve was spared. My second surgery in 2008 my facial nerve was spared (once again) but this time with a dehischence. I do have mild palsy, but not seen by lay people only me and my doctors. I still have numbness to the tip of my tongue, some days I can taste well, some days I can't--no biggy.
I really believe this tumor was there from the very start of my life, but did not notice this until 1991. Doctors cannot prove this, this is just what I believe as I know myself and body intimately. I have always been able to detect idiosyncracies long before doctors.
Like you my symptoms started with balance, facial issues, and finally hearing loss. Most people start with hearing loss, then balance, then facial issues. Hope this helps you in making your decisions, I know this is overwhelming, but you do have much time to consider all and that's the "blessing" of this type of tumor--time and choices.