im trying to find out how much of a dps decrease i'd be getting if i did 4/5 IAOH vs the full 5/5.
just tryin to possibly free up a point for 5/5 survivalist with keeping detterrence. If the damage difference is too great then im just gonna keep 5/5 IAOH. 5/5 survivalist gives me roughly 140+hp vs 4/5 survivalist.

Lactoce made a nice hunter damage spreadsheet, take a look at it and see the dps difference.

Which one to pick depends if you like PvP or PvE more.

You will have to search, but look for posts by Lactoce that have hunter in the title ;).

Yeah, this spreadsheet here will give you a good idea of how much DPS you lose in a PvE setting once you plug in your stats and spec, while there was a discussion about Imp AotH math here. There has also been some general discussion about hunter talent specs in these threads.