where and in what form business layer should be implemented

I have to design 3 project whose specification are as follows:

1. Client server architecture , windows application , office administration site
with book library in place.
2. 3 layred web application , ecommmerce aplication with webservices in place for
business layer implementation.
3. 3 layered we application , workflow application

What of the following technologies should i follow in the above cases with
performance issues and impact

1. COM+ with MSMQ and MTS with and without workflow and rule based engine
2. workflow engine
3. rule based engine
4. Business layer compiled inside the application
5. Business layer inside stored procedure
6. Business layer implemented in webservices with or without using workflow and rule engines

Also give me your criticakl comments on performance issues arising out of usage of

workflow and rule engine vis a vis increase in scalability and agility
bhaskar

seekbhaskar@gmail.com