Webcam capture with OpenCV and multiprocessing, gui crossroads.

So, right now I have a basic version of Behave with multiprocessing and I ask myself: is Tkinter the right choice?

Good comparative with different Python guis:
http://www.pythoncentral.io/introduction-python-gui-development/

Options
http://wxpython.org/what.php
http://zetcode.com/gui/pyqt4/
http://kivy.org/
http://www.cosc.canterbury.ac.nz/greg.ewing/python_gui/
Behave needs a lightweight gui, simple and flexible, since there is nothing out there that gives much more than what I have, I'll continue tinkering.

About the 90's look of Tkinter, it seems you can give Tkinter a more modern one:
https://docs.python.org/dev/library/tkinter.ttk.html#module-tkinter.ttk

But with Python 3.x, maybe this is a good moment for me to move away from my comfort zone, 2.6 and 2.7 ?