What I would recommend is an Olex AI 970, 111, 121 or 131, but make sure the unit comes bundled with a light sensor. These units, which are powered by direct connection to AC power, can be used as is with UV tube banks of up to around 500 watts, but for use with a HID lmap you will either need a Controlled Light Intensity Box, or a tripping relay.

The Agfa unit now for sale on ebay is really made by Olex and is same as theeir TI 985sc, but it is being sold without a light sensor. Also, in order to use this unit you would need a CLI because the TI 985sc is power wired through the CLI, not directly into an AC outlet.