Have a Duemilanove and an Uno.
I use clones that add value.
Boarduino, Seeeduino Mega, Seeeduino Stalker, Sparkfun Pro 3.3, Sparkfun Pro Mini 3.3, ArduPilot Mega, Teensy, Plus many standalone in various projects.
There isn't a point of buying a straight Arduino Clone that doesn't add value somehow.
The boarduino might as well be a permanent installation into my breadboard.
I like the smaller form factor on the Seeeduino Mega, and the mini usb-b, and a switch for the manual/auto reset. The Stalker adds a RTC, micro SD, Xbee, and a 3.3v/5v I2C hub. The Pro Mini was nice for a one off project with very limited space. (In retrospect, I would probably use a teensy next time).
Anyhow, Thank you Arduino team and keep up the good work.