Congrats! All bands of the same size will fit. Whether or not they look good is in the eye of the beholder.
Agreed...I'm a little upset that the space grey stainless steel wasn't offered with a cheaper band. I didn't like the basic stainless steel look. I like the dark space gray, so I chose that watch. I'm concerned about the sport band falling off. Is the sport watch pretty much the same as the stainless steel except for the casing?
They are all the same except for the case materials/bands (including Edition). The sport band is probably one of the most secure bands they sell.
The screen is glass rather than sapphire on the sport other than that and the casing all of the watches are identical. All the bands will work in between different models, but Apple does limit you to certain ones when you order the watch, you can buy extra bands from any range though.