BSIM3 and technology related question

Hi all,

I would be working on designing circuits at sub-threshold logic level.
Before I start designing and simulating small little circuits I have
to know a couple of things.

I understand that BSIM3 models are modelled quite well in sub-
threshold region. But I am not sure if there are other models which
are good compared to that. The questions that I have are related to
this basically.

1) Are there models which I could possibly use which are better than
BSIM3? If yes, what are they?

2) How do I know that the models that I am using currently belong to
BSIM3 or something else? How do I change those models in Cadence?

3) How do I get parameters like gamma, k, mu, Vth etc for a particular
technology. Every one says that it is in the technology file. But my
question is where is that technology file?

I understand that most of the questions are not Cadence related but
please :-).

Thanks and Regards,
Naveen.