registration new registration [25june2017 onwards till 3-months] ; which new-registration type should i choose; normal taxpayer , gst practitioner , tax deductor at source or tax collector at source ?

Iam a contractor (partnership-firm), we take Govt. Contracts/Tenders for-example; bridge-repairs etc.. for which we need all the construction material items like steel/cement/etc..

I think, i should choose "Normal Taxpayer"  https://reg.gst.gov.in/registration/

will it be correct to do so??