What version of Myth does knoppmyth install? I don't use knoppmyth, but I know that at least .20 and further no longer use a separate "live buffer," they just record live like any other recording in the recordings directory (what you are planning on partitioning as /myth) so you wouldn't need a separate partition for that. Just for safety and possible future planning I would recommend a slightly larger / partition (closer to 10GB). And if you ever plan on expanding memory maybe a slightly large swap (This might seem a little wasteful, but having them bigger won't really cost you much program space for HD programs and make may thing easier on you down the road).
Ext3 isn't so bad and it is resizeable, and it works well for me, but the other filesystems are faster. I use ext3 because I can easily read them with my XP machine using fs-driver, as my machines serve a few functions in addition to an HTPC.
Just my 2 cents.
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