I want to remote control my Ubuntu from another Ubuntu. I need to have audio support and fast connection with the ability to issue shortcut keys, clipboard copy and use language switching.

I've heard about:

VNC

VNC + SSH Tunnelling

NX Server, free edition

FreeNX

NeatX

X2Go

X11 Forwarding over SSH

xrdp

x11rdp

LTSP

x11vnc

What I have tried so far:

VNC (SLOW)

VNC + SSH Tunnelling (SAME AS ABOVE)

NX Server, free edition 

FreeNX (LIMITATIONS -3 users - resolution...)

NeatX

X2Go

X11 Forwarding over SSH

xrdp (AUDIO SUPPORT - COMPLEX DEPLOYMENT)

x11rdp (AUDIO SUPPORT - COMPLEX DEPLOYMENT)

LTSP

x11vnc (AUDIO SUPPORT - COMPLEX DEPLOYMENT)

The solutions in What free Remote Desktop (server) solutions are there? do not answer my needs.

Note: Ubuntu may be going to remove xorg implementation in the next release (14.04 LTS) so we will not have the option of x server forwarding. I am developing Android applications and the Android emulator I use cannot run in xrdp. I can only start it with vnc. So I suffer from switching from xrdp to vnc all day.