Well done on your first images
Stick with the moon for a while - it's a fantastic object for the budget conscious and with 2nd hand Canon DSLRs going pretty cheap + an EOS adapter and off you go for under $500 (or Nikon or Sony etc)
You'll be suprised how much time you'll spend on the moon before diving into the darker (and exciting) path of astrophotography where $$$ and time get ya.
Keep at it.
Darrin...