I chose 'new posts and my replies' even though I do go forum to forum as well.
The problem with new posts is, is that it doesnt work.
The way I do it is when I first log on I check my replies. Someone mentioned that they just check new posts and anything they replied to is in there, but that doesnt work for me. Everytime there is a post that I have replied to with new posts, but not marked as having new posts. Then I go forum to forum, because just like with my replies, there are posts in the forums that I either have not seen, or ones that I have seen, but have new posts, but are not marked with new posts.
Then, after I go through the forums, I pretty much just use new posts.