Recommendations on development language/environment for web presentation layer

Fellow iSeries developers,

What are your best recommendations for development language,
environment, tools, etc., to create a web presentation layer and
application layer over iSeries tables that make up an iSeries Data
Warehouse/Data Mart/Operational Data Store.   As an aside, the database
will be DB2 tables created via DDL and access from the presentation
layer/application layer will be via SQL and stored procedures fostering
static SQL on the iSeries as much as possible. 

Since I'll do a prototype and then the production application, I'd like
a toolset that allows for easy development of the first and flow into
the second.   I'd like the language/development environment NOT to be
esoteric and out of the skills mainstream.  I'd like the
language/development environment to facilitate ease of development,
maintenance and rapid development.    I'd like the language/development
environment to have a track record and probability of being around in
the future.

Having said all the "wants", I'll entertain alternative suggestions.

Thanks in advance,

Dave Odom
Arizona