best prototyping tool

Does anyone have a recommendation for a prototyping tool?

I'm research prototyping tools for my company and have been advised to look
at
http://www.serena.com/products/prototype-composer/home.html

Serena looks nice: it is wysiwig. drag-n-drop, with many field types such as
date input, and, most of all, an abliity to track requirements as screens
are prototyping.

OTOH, netbeans lets you drag and drop jMaki components so could effect
something similar sans requirements.

OTOH, Flex Builder lets you drag and drop Flash components so gives you the
best GUI experience possible to date. Yet no requirements tracking.

The latter two could possibly produce real, usable artifacts for the dev
team.

My big challenge is our product gets embedded into corporate webapps so must
be vanilla, customizable technology. Flash is out. Today is it <table> based
so x,y positioning (Div, wysiwig drag-n-drop) is hard or at least a sea of
change.

Does anyone have a recommendation for a prototyping tool which makes sense
for a very large (>2M LOC) J2EE project which is still moving to Struts 2?

Thanks!
tim

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