I would look at it at 100% and try your different settings, so you can see halos, etc.
I had read once that if it looks a little crunchy at 100%, that is what you want for prints. Not sure how much stock you would put in that. It also can depend on the distance it will be viewed from. The farther..the less "sharpness." I usually just sharpen till it looks good to me without halos at 100%, and my prints I order come out VERY GOOD (especially from DPCPrints).
If it isn't sharp enough originally, doing more will only make it worse.
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