The Best tool for building Sencha (Ext JS) applications are?

Question

I started working on Ext JS, but the building process has always been a headache to me as I always used notepad..

Can you suggest some tools which help me build the Ext JS applications easily....

Answer 1

Initial GUI Setup (if you're feeling lazy!)

Ext Designer

IDE for further development

Aptana Studio or CodeRun (online) or eCoder (online)

Bug testing during development

Firebug

Debugging the final layer of polish

YSlow for Firebug