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Hi,
Aperture is king.
If you are talking about portability then given that you are prepared to cart an EQ5 around there is no difference between an 80mm or 120mm. Either scope would sit in a box on your back seat. A 12 inch DOB goes in the back of a Hyundai so a refractor is ridiculously easy to cart around.
If you can afford it and if you must have a refractor go for a 100mm Saxon/Orion, at least they are ED's and as always the bigger the better.
As far as accesories are concerned, a 300 buck televue diagonal will not give you much better viewing than an 80 buck GSO one. As with eyepieces, do you want to spend 1000 AUD on an Ethos? Get the biggest aperture you can afford and some cheap eyepieces and then see what happens from there.
Cheers
Paul
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