I replaced my T5s once a year, but they are at least 20 dollars a piece for quality lamps, so you are looking at $160.00 a year minimum for the T5s. As you can see, no one touched on halides because they are obsolete in my opinion. A ton of heat, also expensive lamps (you would need 2 a year at about 60 bucks a piece), and a lot of electricity usage.
As for the LED
technology, you can do the job over your tank for about $320.00, and they do last much longer than halides and T5 lighting. If you take a look at my tank build there are links to different LED
fixtures that are in that price range. You can also go for the more expensive ones that have more options. It's not necessary to spend the extra dough however.