Putting opponent all-in on the river ...

[Richard Tanner]

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i round up, so in this case id just go 5

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Wow, this really is a great OP. This, by the way, is the correct answer. In my experience, betting his exact stack projects an image, not of weakness, but of stregth. It's almost as if you know you've got him and want to make sure you get his money.
Rounding up however, seems to project the idea that you might be trying to buy it by betting a larger amount.
As for pushing, I think most newer player or awful players associate an "all-in" with a big hand, so that's less likely to be called.

Cody