Hi confusedinPhilly,
As you can see in post #2 here … there are too many variables and unknowns for anyone to recommend a specific mattress for anyone else based on a few statistics about their body type or sleeping positions.
I can certainly help you with HOW to choose though 
The first place I would start is post #1 here which has all the basic information, steps, and guidelines that you will need to make the best possible choices.
Once you get to step 3, the better options and possibilities I’m aware of in the Philadelphia area are listed in post #4 here.
If you are looking for a mattress that only needs to last for two years … then reasonable quality materials would still be important but careful testing for PPP (Pressure relief, Posture and alignment, and Personal preferences) would be more important yet because most mattresses that are well within the range of your needs and preferences would last for that long as long as you don’t choose something that was on the edge of being too soft which may put you “out of your range” even with the initial break in period and foam softening.
Out of the options you mentioned … Brooklyn Bedding is clearly better value but I would also consider one of their mattresses where you could exchange the comfort layers if necessary unless you were confident that a choice that didn’t have any exchange options available would be suitable for both of you (and for some of their mattresses they can tell you about similar mattresses that you can probably test locally to get an idea of how a specific model feels and performs).
If you have questions along the way … don’t hesitate to post them on the forum.
Phoenix