Hi,
My suggestion is to NOT get any other dog, until you find out how to train one!
The one you have now is a "working dog". She needs lots and lots of exercise. Take her, everyday, for at least a brisk 45 min. walk. This will help release some of her energy (and aggressiveness). Has she been spayed?
If not, then have her spayed. This will also cause her to not be so aggressive, and when around other dogs, they will know it. They will also not be so aggressive towards her.
Any dog you get is going to bark! Some of the gentler ones will also bite! You have to know what's going on, and how to make them do what you want them to do, and not having them do whatever they want. Any dog is happier, having you in control. They are happier when they don't have to make all these decisions, about loud barking and biting.
You need a good Dog book, about training, or if you can't do it yourself, ask about some training classes for you both, together.
Here is some more information:
I highly recommend a video by Ceaser Millan, a Professional Dog Behaviorist. He rehabilitates dogs, and trains people.
He has his own TV program, the Dog Whisperer, on the NGEO (National Geographic) channel, on Friday nights mainly, but also comes on some other days. This video is available from:
http://www.dogpsychologycenter.com/
I also ordered his new book, "Ceaser's Way", from Walmart online, around $15 US, and it's very good!
There are other good videos available on the web, but this one is really worth your attention.
Also, if you get the TV channel, Animal Planet, look for a program called "Good Dog U". It's also a good one, with training tips and how to calm down any dog. I do wish you the best.