I've never heard females being more aggressive than males, and I've never heard males being more aggressive than females. I have a female and she is as sweet as can be, and has never acted aggressive towards me.

The best enclosure, IMO, would be a tub. They are pretty cheap, and you can buy the clear Sterilite or Rubbermaid tubs. All you need to do is put some air holes in it and your good to go. Maybe also buy some clips to keep the lid shut so your snake doesn't get out.