Hi benjammin,
[quote]Well, here’s an update three years later.
It’s good to be back. I’ve always enjoyed reading the posts here and in previous mattress forums. [/quote]
Thanks for the update … and welcome back 
Different people would have very different definitions of the “best price/quality” depending on the properties of the memory foam they prefer (density, temperature sensitivity, response time, firmness/softness, ventilation/cooling, and others) and on all the other parts of the “:value” of a topper purchase that are important to them (including price, return/exchange policies and cost involved, delivery cost and time, and the knowledge and the guidance they provide) so there really isn’t one “best” answer to your question.
Having said that post #4 here includes a list of the better online sources for toppers I’m aware of. They would all be knowledgeable about how the memory foam they sell compares to others on the market and if they are familiar with Sensus then they would also be able to help you compare their memory foam to Sensus as well. Two of them (Rocky Mountain Mattress and Sleep Warehouse) also sell Sensus memory foam if you want to stay with something that you are familiar with.
Post #2 here and the topper guidelines it links to can also help you use your sleeping experience as a reference point and guideline for choosing the type, thickness, and firmness for a topper that has the least possible risk and the best chance for success.
[quote]2. If we go with latex would Puralux 3" 20ILD be a potentially good choice? We’ve been reasonably comfortable on 28 ILD Talalay in the past for a short time. At least there seems to be a good price available for it online.
3. We have a 150+ pound dog and a 60+ pound dog that jump on the bed so we need something durable.[/quote]
All latex would make a durable choice compared to other types of foam materials and Puralux is among the lower priced versions of latex available so if cost is the primary factor then it would make a good choice. Based on your previous comments 20 ILD would probably be “in the range” that could work for you although it will be less resilient than the talalay you are sleeping on and the only way to know for sure will be based on your actual sleeping experience. Your previous comments also indicated that sleeping directly on the 28 ILD latex in your mattress wasn’t “too bad” so you may not need an additional 3" and 2" (a “little to a fair bit” of additional softness and pressure relief) may work well. In very general terms thicker toppers are more pressure relieving but can also be more risky in terms of alignment.
The component post also includes the better sources for covers I’m aware of as well and some of the more stretchy knit covers are listed in post #4 here. There is more about the pros and cons of a quilted cover vs a thinner stretch knit cover in post #12 here.
There are also some comments about the SleepEZ cover here and here and the Mattresses.net cover here.
Phoenix