I've never used the first two (I own a Rigol DS1052D, very similar to the 1102, and it's great), so I can't comment much on them. Just want to warn you - your oscilloscope is one of your most-used pieces of test equipment. If you buy one that is a piece of garbage, you'll regret it very quickly, and you'll be out the money that you could have spent on a better one. In the absence of good information and reviews of the first two, I think I'd spend the extra money and get the Rigol. Even the 1052 instead of 1102 is decent, and they are about as cheap as a new, good oscilloscope can be.