Using barlows just add glass which affects the view making the view softer. I would highly recommend you use an ep on its own. If planetary is your thing I found these
Kokusai Kohki ORTHOSCOPIC http://www.kkohki.com/English/kkohkiparts.html a great eyepiece at a good. I find the more simple the eyepiece design the better it is for planetary views. At 1000mm f/l id be aiming for a 4mm, 5mm,6mm,7mm,8mm there abouts.