Ok what is the light for tho? Is it heavily planted or just lightly planted etc. For a medium-heavily planted tank, I'd suggest T5s. But if its lightly or hardly any plants then T8 tubes might work out better. It all depends on what is in your tank or how you want it to be (whether its gonna go full on with plants or be solely ornaments etc with less plants, or more light to make the fish easier to see).
You also have to remember that with this hobby (most of us are hooked and are always looking at upgrades), that spending a little more money at the start saves you alot more money later on. Just keep that in mind .
Hope this helps