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Hi Chantal,
You will be paying good money for portability but limited capability.
Assuming the eyepieces stated on-line, you will not get enough magnification out of the SkyWatcher heritage for planets (telescope 650mm / 10mm eyepiece = 65x). You really need double that (130x). The refractor is barely passable at 600mm / 6.3mm = 95x.
You can get a 6inch Dob under $400. It's not as portable but is a whole lot more flexible and will give you a lot of DSOs to look at.
A Dob will cool down faster than any other scope of the same size as it is an open design. Refractors, Maks and Schmidts hold the hot air inside and can take a while to cool down.
A full tube Dob (as against a truss-type) should hold its collimation pretty well. Collimation for Dobs can be done in minutes with a laser collimator but this will cost extra.
Regards, Rob
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