Personally, nothing could replace my nexus 7 as of yet. the form factor is much better than that of the ipad mini. and I love 7" because of how light and easy to hold the tablets are. you can use them one handed when you need to. i can type on the nexus 7 relatively easily one handed. if i was going for a 10" though, i wuld go for the nexus 10 or the transformer infinity.
Check out iPads in the refurb section of apples website, just got one and it's great, android tabs are ok but don't compare to iPad and you know you'll get updates for few years not just one if your lucky
You also get the updates with the nexus tablets. anything labelled nexus gets the same update style as ios devices. even though you dont need them as android 2.2 is more advanced than ios 6.