SWS technologies

Hi all,

I need to develop a SWS to publicly provide data from medical trials, and I
am wondering what set of technologies is the most appropriate to build my
SWS. I am thinking of selecting one of the following options:

1) WSDL referencing to OWL-S instances (through the OWL-S extensions to
WSDL) and OWL-S instances referencing to ontologies from the medical domain.
2) WSDL referencing to OWL-S instances (through the SAWSDL extensions to
WSDL), and OWL-S referencing to ontologies from the medical domain.
3) WSDL directly referencing to classes/instances from medical ontologies
(through the SAWSDL extensions to WSDL).

My service will be a simple service, with just several "atomic" operations,
so I think that I probably don't need the semantic complexity provided by
the OWL-S ontology. I think that the best option is 3, anybody could help me
to take this decision?

Thank you very much in advance.

Regards,

Marcos.