[ZrByte]

Another vote for a tablet, just not necessarily an ipad, you can get the transformer for a fair bit cheaper than you have linked to even with the keyboard which you don't really need. And its as good or even better than the ipad. Only loosing out slightly for simplicity.
Do you need to buy it right now because the next wave of tegra based android tabs are supposed to be getting launched in the next month or so and if anything can handle a raw mkv it will be a 4 core tablet. And if you don't go for one of those it will almost certainly have a knock on effect on the price of the lower tegra 2 droids that are classed as high end now saving you a packet.