It is beginning to sound like a typical GamePark upgrade. Get rid of all the old problems and annoyances and replace them with totally new set of problems and annoyances.
Mate, get some facts before you make those judgements. btw, what "new annoyances" were introduced with the original BLU upgrade (not the BLU+)?
The Mk2 GP2X has these differences:
* The joystick is rotated 45 degrees making it easier to hit cardinal directions (up/down/left/right). The Mk1 has the stick improperly aligned so that it has a diagonal bias. The Mk2 also supposedly has a smaller deadzone.
* New LCD screen which is brighter, sharper, and has a higher contrast. It also has no interlacing, which was the major annoyance for Mk1 owners. It has a slightly tighter viewing angle (i.e. if you tilt it too much up or down, you can't see it as well from those angles).
* More power to the EXT/USB ports (for future expansion).
Unless you can call the viewing angle a "problem or annoyance," then the Mk2 is an improvement in every way.
That being said, a few people actually *liked* having the interlaced screens, and in reality there is not a huge difference between Mk1 and Mk2, so picking up a Mk1 cheap could be a very good move. It depends on your tolerance for the issues described above.