Hi Cloudz,
Welcome to the Mattress Forum! I’m glad you’ve found us. 
You can see some comments about Ideal Mattress in the Toronto list here (which I know you already found) and a forum search on idealmattress or an exact term site search on Ideal Mattress Ltd (you can just click both links) will bring up all the forum posts with comments or feedback about them as well.
While other people’s comments about the knowledge and service of a business can certainly be helpful … I would be very cautious about using other people’s experiences or reviews on a mattress (either positive or negative) as a reliable source of information or guidance about how you will feel on the same mattress or how suitable or how durable a mattress may be for you and in many if not most cases they can be more misleading than helpful because a mattress that would be a perfect choice for one person or even a larger group of people may be completely unsuitable for someone else to sleep on (see post #13 here).
I’m assuming that you’ve read the mattress shopping tutorial here but two of the most important links in the tutorial that I would especially make sure you read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort” and 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 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 (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists (based on all the parts of your personal value equation that are most important to you).
I would keep in mind that the first “rule” of mattress shopping is to always remember that you are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved that are unique to each person to use a formula or for anyone to be able to predict or make a specific suggestion or recommendation about which mattress or combination of materials and components or which type of mattress would be the best “match” for you in terms of “comfort” or PPP (Posture and alignment, Pressure relief, and your Personal preferences) or how a mattress will “feel” to you or compare to another mattress based on specs (either yours or a mattress) or “theory at a distance” that can possibly be more accurate than your own careful testing (hopefully using the testing guidelines in step 4 of the tutorial) or your own personal sleeping experience (see mattress firmness/comfort levels in post #2 here).
The “value” of a mattress purchase is always relative to how it compares to the other specific mattresses or “finalists” you are considering (in the same size of course and based on “mattress only” to “mattress only” comparisons) or that are available to you either locally or online and there isn’t a “formula” you can use to assess the value of a mattress because it depends on each person’s criteria which can be different from person to person.
Having said that … there is more about the most important parts of the “value” of a mattress purchase in post #13 here which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists (based on all the parts of your personal value equation that are most important to you).
Looking at the Ideal Mattress site, they have a few items in your budget range, but they aren’t very specific about the actual components in the mattresses you mentioned. While I can’t speak to how any of those mattresses will feel for someone else … I can certainly make some comments about the quality or durability of the materials inside it if you’re able to find that out about a particular model you might be considering. If you visit the store, they should be transparent with the actual componentry, layers, and density of the foams.
I look forward to learning about your progress.
Phoenix