Thanks for the response Geomancer. Yeah, the main reason was due to the difference in price as well as availability of the bulbs locally as far as switching from T5 to T8. Since we now have a baby on the way I am trying to wrap up all expenses on extras such as this asap, lol. Especially when I wanted to try out different ones to see the difference, such as run one 6,700k and one 10,000k, I noticed it started adding up. I might just stick with what I have and bite the bullet on bulbs for now, seeing as a couple more sets will probably last me till the end of next year. Not sure...
As for hanging the lights, that is because my tank isn't getting even lighting. I have glass tops with the black hinge strip in the middle. The strip blocks a good portion of the light when placed in the middle so I have the light sitting to the back of the tank. It just doesn't look right as far as the shadows (to me) with the light coming from slightly behind the fish and plants, and I also noticed plants in the front tend to try and lean towards the back. I figured if I put together all glass tops and hung the light in the center it would fix that issue. Just wasn't sure how high I should/could go.