Hi eopandabear,
I think you did some good research and ended up with what seems like a good choice in terms of PPP and it also seems to use good quality materials as well (assuming that the gel memory foam is 4 lbs or higher and that any polyfoam in the quilting layer isn’t too thick).
Even though the mattress is on the high side in terms of cost … it also has the advantage of being two sided which will extend it’s useful lifetime (as long as you flip and rotate it on a regular basis) and the cost of a mattress is only one part of each person’s personal value equation (and arguably not the most important part). There are also a lot of people who like the “feel” of thinner layers of memory foam over a more resilient material like latex because it can combine the feel and performance of both materials (some of the slow response of memory foam over the more resilient feel of the latex underneath it).
Overall it sounds like you made a good choice and I’m looking forward to your feedback when you’ve had the chance to sleep on it.
Congratulations on your new mattress 
Phoenix