Telluride
Pretty good place, with scenic mountains.
Jackson Hole
Excellent place and incredibly scenic. July will still have significant snow on the higher peaks.
Lake Tahoe
Meh. It's nice, but there are better places in the Sierra. I prefer the area along the east side of the Sierra, but farther south.
Anchorage/Wrangell-St. Elias
Excellent, but July tends to be very wet. June usually has better weather. July is still doable, but climbing conditions usually aren't prime then. Also, you can't really see much of Wrangell-St Elias if you don't want to camp. If you stay in some of the lodges around the outskirts, you may or may not ever see the mountains since you are going during the wet period. This is especially true with your short time schedule.
Lake Como/Zermatt
Very spectacular, but very EXPENSIVE, especially in July. I don't know what your budget is, but this will be the most expensive destination on your list. If you can afford it, go for it.
Scotland.
Do you like British history and castles? If that is not your main goal, know that the Scottish Highlands aren't any more scenic than the Colorado mountains. Think Trail Ridge without Longs Peak.
Maybe consider the Canadian Rockies as well. Lake Louise would be awesome and better than Tahoe or Scotland, as far as really spectacular scenery goes.
I'm slow and fat. Unfortunately, those are my good qualities.