Sills bulbs crap out on the uvb early so I wouldn't recommend them.
I like the reptisun but get the 18" T8 15 watt bulb
Then you can get a "under the counter" light fixture from Walmart for $10 and just put that UVB in there. Home Depot has them too but there $12 there.
The fixture is made from GE and looks identical to the zila one you linked above. I just bought 2 of them for my new cham enclosure I'm building.
1 fixture for the uvb and 1 for a plant grow light.
If you decide to go with a t5 bulb you will have a harder time finding a fixture for it that matches the watts as the bulb. That's why I like the 15w T8 reptisun bulb... that's the same size and watts as your basic fixtures.