The HD will serve you better in bright sunlight, substantially reducing glare that can prevent you getting a good view at your potential target. Same goes for rifle scopes. Worth the extra $$$.
What HD (or ED, APO, FL, or whatever the company wants to market it as) glass does is minimize Chromatic Aberration (CA). CA is visible as color fringing around high contrast objects in the field of view. Low levels of CA increase apparent resolution and contrast, which does help you get the best view of your target. Glare (usually veiling glare) is controlled by the physical design of the optic, usually by the placement of baffles behind the objective. Other types of "glare" include internal reflections caused by prism edges, and imperfect interior blackening.
HD glass certainly helps in bright sunlight, as bright scenes often have a lot of contrast, which increases CA. The non-HD spotters from Swarovski are excellent instruments with top-notch glare control. Their only (minor) weakness is they do show some CA.
IT sounds like a fair price, crbarg, and i think you will like the spotter. I look forward to a field review with trophy pics!