Depends on your budget. I have a Viking which is extremely expensive even when it's on sale. Look into the Brothers, I have seen people in classes I have taken with Brothers who are very happy with them. Make sure whatever machine you get you can easily buy single embroidery designs for off the internet. It will save you a small fortune to be able to buy just one design instead of a whole package. You have already received some great ideas in previous posts, consider them all.
Kat