Re: GRE Score
^^ errr... can you tell us more about the type of programs you're aiming for... many Masters programs in Business would typically require the GMAT and not the GRE - unless the program specifically asks for the GRE.
I've been on the admissions committee for the MBA and the MSc program, and we typically look at the percentiles more than the absolute scores.
On the outset though, your verbal score seems good... the average I've seen for grad admissions is around 510ish. On the other hand, most applicants score significantly higher on the quantitative section and I'd say anything above 600 is considered safe.