Firstly, jeppview Will NOT run on iPad. Jeppesen terminal charts will using the Jepp iPad app but that is a very different thing that is basically a chart viewer.
OZrunways is a reasonable chart viewer for ASA charts, if you are happy with them.
Ozrunways - in my opinion - is not good enough for IFR flight use. yesterday I came back from the UK and tried running ozrunways from the window seat if an A380. The iPad gps is pretty patchy ( not unreasonably) but my concern is that ozrunways on the iPad will give an indication of satellite gps reception and display flight data that is completely wrong due to poor gps reception.
Ozrunways is a pretty good VFR aid - especially for local flights n areas where it can use the mobile network for assistance, but it's not in the same level as jeppview for IFR. Nor do I believe it is intended to be.
Secondly, The best tablet for jeppview is he motion CL900 or a secondhand LS800. There is a viewsonic windows tablet that looks good and an Asus one that might be ok and is pretty cheap - especially on eBay. You need to give thought to battery life and have a Power back up strategy.