Salty92; The important thing about Live Rock, IMO, is that you have enough to handle the bio-load for your system. Once you have that amount, then add more only to suit your own aquascaping tastes...
your planned lighting should be enough for SPS, though getting 10 T5 bubls into the canopy might be harder than you think... If you can get 8+ in there, i'd say you'll be fine on SPS.... (Are you using ICECAP balasts & reflectors?)
Personally, my advise is to put as much LR into your sump area as possible, so that you can have as little LR in the display as possible. This will be ackward looking for the first year. But in 2 years, when the SPS grow out, you'll have some MONSTER corals that will dominate your tank, as opposed to cramped corals on loads of rock.
I made the mistake of making Interesting Looking Aquascaping out of rocks. Which while my corals are growing in, looks cool enough, but now that my corals are getting bigger, and i've added more of them, it looks really CRAMPED again... I cannot imagine how cramped it's going to look in 6 more months (but new tank is in the planning stage so hopefully it won't be a problem).
My next tank will have almost NO ROCK in the DT. There will be less than 50lbs in a 180gallon DT. (the sump has 250lbs already in it which is why I can get away with that low amount btw).
In 2-4 years my SPS should be quite large and dominate the entire tank... Until then... it will look frigg'n weird I admit... but the end goal is more important.