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I still say 6" f8 and you wont need a collimator as you can do it by eye at f8 reasonably accurately. Also 1200mm focal length will give you 120x with a 10mm eyepiece meaning you can get a good image size for planets and you wont be spending money on a Barlow or shorter focal length eyepieces too soon.
Even if you go with the one you've mentioned you can still do a pretty good collimation by eye and you can save yourself the extra money. I collimated my 6" f5.5 for many years with a simple film canister and by eye. For critical fine tuning I used a bright star and tweaked the primary knobs until I got concentric rings. I have a laser collimator now but hardly use it as I prefer the star method.
However if you are after something smaller and more portable for travel then either the one you mentioned (since a couple of users say its OK) or consider a short refractor but note anything with a short focal length will need short focal length eyepieces to show planets at a good image scale. Short telescopes do excel at low power wide field viewing if that is what you are after.
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