I've well developed Python Server having workflows, views, object - ORM/OSV, etc...
Server/Client communication based on socket protocol,  can be done by any of service 
1. XMLRPC Service
2. Socket Service 
now I want to develop a Fully Ajax based GUI web Client..
I've web/socket services to communicate with server.
what I need is to select the technology, I've several options like,

ExtJS - CherryPy
GWT
Ext-GWT
CheeryPy
Django + JQuery
Django + Extjs
???
???...
How about Pylons + SQLAlchemy + ExtJS? We use it and it works great!
Which technology is preferable to build a web based GUI Client?