UPDATE:
Just to round off my issues, I have sent the Ipad to Apple who could not fix the issues and even though my Ipad was out of warranty (by 2 months) they have kindly issued me with a new Ipad. Therefore it appears that my issue was probably hardware related(?) and my only dilemma is do i stick with the Ipad? If the Nexus 10 had 3G i would be seriously tempted to move.
You can be certain that it was a hardware fault. Glad to hear you got a replacement. Apple tend to be very good like that.
As to your dilemma, you wouldn't get anything but biassed advice from me, so really the decision is yours... Only you can decide which is the better device for your needs