Well, this plan started with Antelope Canyon and then is creeping…..
My primary goal is still that but am assessing what else I can manage within 6-7 days. So far I had thought that the Antelope Canyons, Lake Powell, Horseshoe bend and on my way back possibly squeeze Monument Valley. I realize that there is so much to see in this area and it should/will take multiple trips to do it justice. I have to be also careful to not enjoy all this from behind the viewfinder. Let me know what you think is doable. Thanks for the link,
Hahaha, I know the feeling well! You're in danger of falling down the same rabbit hole I have. in 2011, I went to Zion, Bryce, Antelope Canyon and Monument Valley in 5 days. Loved it and immediately planned a trip the next year. I bought "Photographing the Southwest" Utah and Arizona editions (highly, HIGHLY recommended, especially the Utah one), and my 2012 trip went from 10 to 20 days, with a 2nd trip later in the year. I've gone back for 1-2 trips each year since, and will be going back this April. There's just so much to see there it's amazing, and I still haven't been able to hit all the spots I want to, let alone in ideal conditions for the perfect shot.
In 6-7 days, you can hit quite a bit; Page can be done in a 1-2 days, assuming you don't have bad luck and get rained out of the slot canyons, and depending how much of Lake Powell you plan on exploring. You can explore a decent amount of Monument Valley in half a day (most casual tourists do this), but I'd recommend something like arriving in the late afternoon, shoot sunset, stay overnight, shoot sunrise, with driving the main loop or joining a tour of it either day.
As with my first experience, you can still squeeze in Zion/Bryce to get a feel for them, or Arches/Canyonlands. In face, I once did Zion, Bryce, Canyonlands, Arches, Monument Valley, and Page in 6 days, but it was extremely rushed and NOT my schedule.
When you're in the Page area, consider a quick easy trip to the Pariah Rimrock Toadstools http://theworldinlight.com/thumbnails/the-toadstools-photos.html#.VMUb_C7rTuw
What month are you planning on? If it's at least 3-4 months away, I'd also suggest looking into Coyote Buttes North (where the famous Wave is located) and Coyote Buttes South (which I consider more interesting and diverse) for another couple of 'bucket list' locations. It's too complicated to fully explain here, but each section basically gives out 10 tickets per day, 4 months in advance, and another 10 the day before (in-person lottery in Kanab). North is a lottery, South is first-come-first-serve; both open up their processes the first day of each month, and May is about to open up on Feb 1st. Both are a bit hard to get to, so I'd recommend hiring a guide to take you and show you the best parts ($150-$175 a day). If you go to CB South, you can also consider adding White Pocket, since it's free and in the area.
If you're going in May and decide you want to go and be prepared to be at a computer Feb 1st; I think the South tickets start at 9AM PST.
Read up more here: http://www.blm.gov/az/st/en/arolrsmain/paria/coyote_buttes/permits.html
The info on the ticket system can be a bit overwhelming and confusing, so if you decide yo want to try for one or both areas, feel free to pm me and I can help walk you through it. I can also recommend guides, who I've used 3 times and will use again in April. Sorry for babbling on too much, but obviously I love exploring Utah.