I agree about the largest hoop you can afford.
Another thing to look at is the method of transfering the design from your PC to the machine. Do you need a special propietary memory card only available from Huskvarna? Or can you use a standard USB? Highly recommend a USB. Some machines have a direct connect to the PC - make sure that is compatable with your PC.
Also, check the format that Huskvarna uses then check several websites to make sure that the format Husqvarna uses is readily available to buy new embroidery motifs.
Lastly ... if you have or think you are going to get embroidery software to digitize your own items, make changes, create stuff ... make sure the software you are interested is compatable with Husky.