Hi sleepsuffering,
While there are certainly other mattresses that use a combination of innersprings and natural fibers (see post #4 here) and there would likely be other types of mattresses as well that use completely different materials and components that you would find just as comfortable, just as suitable in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences), and would be just as durable, they won’t be “the same” in terms of how they “feel” and when you are considering a hand built mattress that uses a combination of natural fibers and pocket coils then the only other mattresses that “may be” somewhat similar would be some of the other ultra premium mattresses such as Hastens … Savoir … Relyon … and Hypnos.
There is more about Vi Spring and other “ultra premium” mattresses in post #2 here and post #2 here but I would be very careful to differentiate how you feel “about” the Vi Spring and how you feel “on” the Vi Spring. In some cases a mattress in this budget range may be “worth it” for a particular person that isn’t price sensitive and that has specific criteria that for some reason aren’t available in lower budget ranges but this would be unusual and in general I would need a very compelling reason that clearly indicated there was “enough” of a difference in “real life” compared to many other mattresses that may be just as suitable in terms of comfort and PPP, just as durable, and that are in much lower budget ranges to justify the higher cost based on all the parts of your personal value equation that are most important to you.
The first place to start your research into an “alternative” is the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that you will need to make the best possible choice … and know how and why to avoid the worst ones.
Two of the more important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress that is the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for that are involved in each of them and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability, durability, and value.
If you are considering an online purchase then the optional online step in the tutorial also includes several links to lists of the better online options I’m aware of (which includes My Green Mattress) that would be well worth considering.
You can see my thoughts about Habitat latex mattresses in post #3 here and a forum search on Habitat (you can just click the link) will also bring up more information and feedback about them. Their latex mattresses use good quality materials but they have limited options to “fit” their mattresses to different people, body types, and sleeping positions and they are also an “all or nothing” choice that don’t provide any options after a purchase other than returning the mattress. While they are a “better than average” choice compared to many mainstream mattresses … for most of the members here that are aware of the many other online choices that are available to them they wouldn’t be in the best “value” range compared to the many latex options that are included in the list of members here that sell latex mattresses online that are linked in the tutorial post. They also don’t sell innerspring mattresses.
If you let me know your city or zip code I’d also be happy to let you know about any of the better options or possibilities I’m aware of in your area.
Phoenix