You can get get a 2" power-mate that your T2 connector for the camera will fit into. Teleview have a 2x and I think a 4x version.
http://www.televue.com/engine/TV3b_page.asp?id=53
From memory the 600d is full frame so you it will be hard to get a decent scale for planetary imaging. You would need a scope with upwards of f15 to get anything that doesn't resemble a small dot. I'm assuming your dob is about f5 if so you would want a camera with a cropped sensor to help gain a larger scale. DSLR dont make very good planetary imagers unfortunately. Your moon image looks really good.
I've been imaging for a number of years now and I've never done any planetary imaging because it takes totally different equipment than deep space photography. I'll get around to it one day.