Hi - My two cents worth - if the SW100ED you have is the old GOLD Pro model hang on to it and use that one for a starter - it is the second telescope I bought, even though it is slow at f9 it is still a very good imaging scope for the price with good optics and a nice flat field.
Attached is a pic of NGC2070 taken with a ST4000XCM to give some idea - picture is unprocessed apart from a stretch.
Cheers
Geof Wingham
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