Dear Tamper84
Sorry I misunderstood your fixture choice. I was thinking down cans/down lites not trouffer style fixtures. The type in your example are great for the job especially with only 7' ceilings. One change, the type pictured are for "T" bar acoustical ceilings. Ask for the same fixture in a flanged type. These have hangers built into them to properly set them in wood frame construction. Also they have a trim kit for the fixture edges to hide the gap between fixture and ceiling. The fixture dimentions are also different. "T" bar fixtures are approx 23.25" wide and flanged trouffers are approx 22" wide for the 24" on center framing.
T8 lamps are a great thing, better light, better color rendition, more lumins of light output for the wattage used to operate them.
These type fixtures are available with up to six lamps per fixture. 2, 3, 4, 6, lamps depending on what your are doing under that light. Ask the sales person to help with count and layout. Fixture companies provide all these services for free and are glad to do it. Stay with as much white gloss/semi gloss as you can stand as it will really help in the long run to reflect that light around for good coverage.
I could go on and on as lighting is a world in its self. Glad to help if I can.
If you have a CED store in your area check them out. Consolodated Electrical Distributers, electrical wholesale but will sell retail if you ask nicely!