You must beware of all publishers. Treble check each time. My own experience is that sometimes publishers tend to take on your work so that they can become more established and reputable. The best way of checking is to go to their web site and see how many books are displayed. If they only have about two or three authors and fill the rest of the space with examples of pseudo covers that they will produce, then think again. It's best to go for a reputable company with lots of books to their web site, and check on Amazon to see how many are there and the reviews. You must also decide if the royalties are enough as well. There is a lot to learn before you go submitting to the publisher. I found the best way is to be in contact with an author society of your genre. They can be most helpful and their members should be able to advise.
Yes, you really do have to carry out a lot of research. As you are in the US, I cannot really comment further, because I don't publish there, but as a rule, the above usually applies.
Take great care and it might be a good idea to join Absolute Write Water Cooler, you can find all kinds of information about various publishers good or bad. It's a minefield, I know, but with the right guidance, you will get there.