Immigration Help

Hi, I am a Canadian nurse who is looking for information from people who have applied for and received Green Cards. I will soon be applying for a Green Card from within the US (i.e., the "Adjustment of Status" way of applying for a Green Card). I have two options for this - one is to have my current travel company as my sponsor, the other is to have take a position with a hospital who is willing to sponsor me. Does anyone know how quickly this process takes? Does it make a difference as to who the sponsor is? I know that there are different Green Card processing centers in the US, does anyone know which is the fastest? I'm in Hawaii currently...

Also, is a person bound to the sponsor legally until the Green Card arrives, or can he/she work for other companies? I have a feeling that the answer to this question is no, but thought I'd put it out there anyway. Not that I think this is a problem necessarily, but if it takes 3 years to receive a Green Card I would want to know that I'm working for a good place!!

Any help that anyone can give would be great! I'd love to hear from people regarding their own experiences, or any knowledge they have to share at all...

Thanks!