Well maybe the best clues are from Medicare, which isn't quite the same as it is a single payer system and Affordable Care Act (ACA) is not. However, not sure you know how this works but each state must set up exchanges (and if the state refuses the federal government sets one up for them). The insurance companies in the exchange must follow general practices such as not refusing pre-existing conditions and so forth. The ACA is more insurance reform than health care reform in some ways, so it puts limits on health care companies and one limit could be what they must cover.
I believe once people on Medicare can get coverage then it's going to be pretty hard to not cover them under the ACA. There's nothing in the Affordable Care Act guaranteeing coverage to trans people but nothing forbidding it either.
So what gives? Well my understanding is that Medicare does not now nor never had covered SRS (though I know that people are getting stuff like hormones, labs, etc.) They are also taking transgender under advisement, but I don't know yet when they will reach a conclusion. The other thing that their have been law suits against medicare. The relationship of Medicare to the ACA is very interesting and one to watch. And I think they are tied together under the whole discrimination aspect.
Specifically under the ACA, the Dept of Health (I think) is interested now in all cases of discrimination against people who are LGBT (fully including the T here). I'm going to look for this site, as it might be useful to us now.
So though things are moving in a positive direction, they might not be moving so fast.
BTW, though I am on medicare, I just started on this about a month ago. I haven't attempted to get any sort of coverage, but I know currently what the coverage is, at least for top surgery (not yet).
BTW, you should be able to qualify for various waivers for income. The initial price for insurance may be the actual cost and not what you would necessarily pay out of your own pocket. I don't know what it is for a single individual as it is always quoted as a "family of 4". I think you qualify for some discounts if your income is under $40,000 as a single person.
--Jay