Which technology is preferable to build a web based GUI Client?
I'm not sure I understood exactly on the server side, but i'm a big fan of Flex as a way to develop proper software for the browser, rather than mess of trying to make HTML do things it was never made for. Partly an idealistic reasoning, but I also am still not impressed by the 'feel' of JS-based GUIs.
Flex has good server-communication options... web-services, sockets, remote objects, etc.
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
???
???...