There are a number of embroidery machine brands out there, and all the big ones like Brother, Janome, Bernina, Singer, Elna and Husquarna have great machines. It really depends on your budget and the type of projects you will likely to be doing that will determine your final choice of embroidery machine.
It is always best to find your nearest reseller, who can give you advice and service your machine. Like all machines embroidery machines also need regular maintenance for a long and happy life. Some of the maintenance you can do yourself, but some will need to be done by a technician.