The kit I linked to should work nicely and comes with everything you need. I suggest selecting the 24w option at the top. That should provide plenty of UVB for at least a year before the bulb needs replacement.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!