http://www.totemspot.com/vb/entry.php?b=41
These haste breakpoint overviews should help you a bit already. They state what you need if you have 5% from the raid and/or 5% from AS, etc.
I'll explain briefly, hopefully answering your question in an understandable manner.
Let's say you're sitting in your raid with your trusty old Boomkin buddy who merrily carries around his pretty 5% haste aura ^^
So you pull up your haste breakpoint card and check the numbers...
With the 5% haste from your Boomkin friend provided, you'll find the following:
To gain an extra tick from Riptide WITHOUT being specced into AS, you'd need 1345.
To gain an extra tick from HR WITHOUT being specced into AS, you'd need 2017.
To gain an extra tick from Earthliving WITHOUT being specced into AS, you'd need 3039.
If you decide to spec into AS, you'll just move a column to the left in the haste breakpoint card where the header reads "AS/+5% raid". These numbers tell you which ratings are important to grab more ticks if you're sitting in that raid AND have AS talented.
The haste breakpoints for getting ticks during Elem.Mastery aren't there, and I don't have them readily available, but I'm sure someone else will happily tell you what haste rating to strife for if you want e.g. an extra HTT tick with Elem.Mastery active