Hi Steve,
Congrats on your purchase
The 80ED is a great scope. I would personally recommend you buy EPs instead of a barlow, I've owned cheap ones to Televue-branded ones and are more hassle then they're worth. I used to own a 4mm or 6mm TMB Planetary, worked very well on the scope. I've also settled on the Orion Stratus EPs for general viewing, good value if you can find them second hand.
Good luck!