you are setting up a really nice system! Are you in a position to demo the cd player(s) in consideration. This is really key, at this level and money involved, you would not want to make a mistake.
Keep me posted and Happy Listening!
I listened to both of the speakers you note, this weekend, at the AXPONA show. While both were very good I favored the Dynaudio. Plenty of bottom with great sound staging and depth, the speakers were about 2 feet from the front wall, in a challenging hotel room. They performed nicely on Jazz, Acoustic (real nice), Vocals and Electronic. Sounded very natural to me. Also note 3 separate rooms had the Dynaudio, the dealers liked them a lot too.
You are putting together a very nice system. Also note there are some very fine used CD players out there, where you can get a lot of bang for your dollar.
If you place the loudspeakers at least 24" out into the room the rear port shouldn't be a factor. Personally I like the Harbeth over the Dynaudio. They have a more welcoming and relaxed sound. Neither is particularly sensitive, but the Luxman should be more than capable of driving both very well. Please post what you end up doing.
I have stayed away from rear ported speakers in the past only because adequate space was a concern. Given unlimited space to play with they often sound superior (to me) unless were talking certain TL's or acoustic suspension. I am a fanboy of both manufacturers. I have listened to Harbeth partnered with high quality Luxman and it was among the best I've ever heard. Detail and naturalism are two words I would use to best describe there partnership.