haven't heard much about lsi, but i imagine they make decent stuff. i hear the 3ware escalade is a very good card, unfortunately i'm not sure what kind of support there is in freebsd (but, linux and win).
for a dedicated raid 5 setup, i would think the highpoint would be fine. the amount of processor power used would be acceptable if it's the box's only job, and the controller is available on the cheap. from what i hear recent bios updates for the card have fixed raid 5 issues, and have considerably reduced the cpu requirements of the card.
you could go with software raid for win, and i know freebsd has modules built in for raid support as well (read the docs). but i wouldn't suggest that much, ESPECIALLY if you're using it in your exisiting setup, and not a dedicated.
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