Personally, unless you have a definite need for iThingys above and beyond the use of SD - get an Android tablet and save money.
I was given an old iPad and just discovered that the operating system is stuck on v5. All new apps require at least v6 or v7 so it won't update and some apps won't work unless I buy another more up-to-date iPad (£500 or so)
At least SD is still working though I won't be getting later improvements.
On the other hand, a new Nexus is around £200 so even if the OS changes, I'm still £300 ahead