Hi There I have also completed a year on 457 visa but my employer is no willing to sponsor, so i have applied for 189. I would like to share wth you that applying for 189 dos takes a bit of time, Required IELTS score, Assessment, and then submitt your EOI. The prepration itself takes about 4 to 6 months depending on what score you need and who is your assessing authority. if you have not prepared for all this i suggest go for ENS, as it is fast. Just mke sure your employer starts to prepare before hand and lodge your application the day you complete year 2.