Re-developing .NET website in SAP EP

hi,

Our client has a website created on the .NET platform. He wants the entire website to be shifted to the netweaver platform and re-developed in SAP EP. Please suggest suitable options of development technology to be used.

PDK for .NET or

Web dynpro java

Portal components(JSP,Javascript etc)

Web Dynpro ABAP

BSP applications

which one should be the best options

thank you !

SAP EP