I like the 5000. But I have put the RSXs on my F250 4x4. I put the 9000 on the H2 because I wanted to "dial in" the ride. But the RSX have the similar technology, just not adjustable. I have the 5000 as a steering dampener on my H2 but other than that, I don't know. You can get the RSXs for less than $50ea, so they are not terrible.
One of you guys needs to take the chance and get the shocks for the rest, that's how we learned with the H2s. I really think you will be "shocked", sorry for the pun, about the difference better designed shocks will have. Just remember to drive over some spot that causes your truck to get unsettled right before you switch 'em out and then go drive right back over after so you can see how big of a difference it makes and tell the masses so they'll know if it's worth it also.
You can get the RSXs for $47.25ea here
http://my4by.com/product_info.php?cPath=22&products_id=38 or you a few dollars more here
http://hotrodoffroad.com/detail.aspx?ID=2154
FWIW I ordered my shocks from the first place and had no problems and they got here within a couple of days. Several other H2 guys ordered theirs from the second place with no problems and the shocks showed up the next day for some, so these should be decent places to order from but also had the cheapest shocks.