My $0.02 would be ...
If you plan on keeping the watch, then value doesn't really matter. But altering the case finish will hurt the resale value (IMO). If you plan on selling it or think you will sell it one day, I say let the polish stay.
Even if you decided to do it, The brushed finish can be "reversed" with a polish.
Here's a brushed PAM000
http://forums.watchuseek.com/f75/new...l#post40508490
I think it looks well done and looks like a 176 case finish, but brighter. (SS vs Ti)
I like it, and was considering it for my 114 at some point.