Hi shawninarlington,
There is a foundation thread here which has many foundation options available.
Some of the KD slatted foundations seem to have had some quality issues recently (which has also frustrated Shawn as well because he provides a refund when this happens and he has told me that there have been more complaints than normal lately) and you will also find that they may have gaps that are wider than 3". For an all latex mattress … the gaps should be 3" or less.
This one in post #4 here has come to my attention recently and it very good value (it has 19 slats) and the better quality wire grid types in the foundation post are also very strong and suggested by several manufacturers (I would make sure it was one with more longitudinal wires in it).
There is a difference between Talalay and Dunlop when it comes to different blends and types of latex (see this article along with post #6 here). The 6" special uses 100% natural Dunlop layers and the 8" has 100% natural Talalay (not blended as was originally stated in this post) in the top 2" layer. With an ILD in the range of 22-24 … the 100% natural Talalay would be similar to the blended talay in terms of durability although the blend may still have a slight advantage.
Phoenix