Replace the blade or replace the plane? I started woodworking about a year ago. I bought an inexpensive Stanley 12-220 block plane, which has been pretty good to me as I have been learning the craft, but it has shown me of late its less than stellar quality, particularly chatter even with a scary sharp edge. 

Will I find a noticeable improvement if put in a Hock blade (~$40)? Or will I only be satisfied if I chuck the thing in favor of a premium tool (~$150)? 