what is your goals for a ripper?
3pt hitch potato plow / 3pt middle buster. might achieve something better if putting in trenches for something.
a backhoe thumb (single position, mechanical position, or hyd version) might be of more advantage, if dealing with root balls of trees / tearing / cutting roots.
pending on bucket size, and what you are wanting to do. there are variety of "teeth" either bolt on or welded on. that can go onto backhoe buckets. to help score the ground to make it easier to get bucket down into the ground.
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looking at there website...
http://www.terramite.com/ ....
Terramite » T5
it looks like terramite's might not allow access to a 3pt hitch if you remove backhoe?
might push you towards looking at 3rd party backhoe thumbs. and/or DIY plans for a backhoe thumb.
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if ripper was purly being used to help with standing water. i might push for already having a backhoe. and spend money on actual field tile / french drain setup. vs getting ripper, and needing to rely on the ripper.