As for what gyro is the best...
It's agreed that the safest gyro for low-time pilot is high-profile gyros like "Dominator" (in terms of stability and agility). Otherwise Domins have very unusual shape and they are also too high to suit some garages. Magni is obviously well-designed but many of us don't like it's high price.
Other proven designs may be SportCopter gyros, new AirCommands, MadMax etc. South-African Sycamore has good responses from owners as well though it seems to be overpriced too. I believe the choice depends much on what kind of flying you wish to use your gyro for as well as what amount of money you plan to spent on it.
Since you're in UK it's useful to contact BRA (British Rotorcraft Assosiation) and to simply spent some time visiting any rotorcraft fly-in to see the things real and to try some gyros.