Hi cat,
I would start with post #1 here which has all the basic information, steps, and guidelines you will need to make the best possible choice and help you with the “overwhelm”. I would make sure you read it like a good book and not 'study" it like a school textbook.
A forum search on Habitat (you can just click this) will also bring up more information about them. There is a fair bit of misinformation on the site and there is also better value available.
You can read more about the different types of latex in post #6 here. Dunlop and Talalay are roughly equivalent in terms of durability. The choice between Talalay and Dunlop is really a matter of preference and both make very good choices in either a comfort layer or a support layer depending on which of the two materials someone prefers and the firmness levels of the layers that are most suitable. You can read a little more about the difference in “feel” between them (which is the main reason to choose one or the other) in post #7 here. Your own personal testing will help you decide which one you prefer.
I can’t imagine someone not knowing whether they like a mattress or know whether it’s suitable in the first 60 or 90 days and I think a one year trial period is more about marketing than anything else. Both Mattresses.net and SleepEz are less expensive and/or offer better options for equivalent mattresses although Habitat has lowered their prices so they are a little more competitive than they used to be.
A good foundation or support system (such as a platform bed) is essential for a latex mattress and a firm non flexing slatted foundation with slats no more than 3" apart is ideal and the most common choice. If you test a mattress on a flexible foundation and it works well then I would buy the foundation I tested the mattress with but other than that I would lean towards a non flexing foundation rather than introducing a new variable such as a foundation that flexes that can affect the feel and performance of a mattress. As long as the foundation is suitable for your mattress then it really doesn’t matter which one you get and there is no real reason to buy a mattress and a foundation together if there are better foundation options available elsewhere. The Laxeby is not a “stand alone” foundation and only replaces the top slats … not the whole foundation … and it needs either a bed or a foundation that fits it to go under it. If you are seriously considering the laxeby then the adjustments would have a bigger effect on a thinner mattress and it may be a good idea to first test the mattress on the floor to see if you could benefit from the additional flex or adjustments of the Laxeby before you buy it and a bed to support it.
The members here that sell latex mattresses online are listed in post #21 here and there is a wide range of different options available.
Phoenix