I'd second Rod's comments. The WO ZenithStar II is a fine scope, optically, mechanically and cosmetically, but I soon sold mine because if as you say, Sub:
"I will mainly be using the scope for planetary viewing with some DSO", then a short focal length (545mm for the ZS80 and 600mm for the ED80PRO), 80mm refractor just doesn't do the business. The relatively small objective cannot deliver enough light for the necessary visual magnification, so you can expect crisp and contrasty but very tiny views of Saturn and Jupiter - other visible planets will only be dots.
There's more info on the new SkyWatcher LET series eyepieces at the manufacturer's website here:
SkyWatcher LET eyepieces. The 20mm eye relief sounds good, but the field of view (45 or 50 degrees), is pretty narrow.