Look for a Monster 9000 for around $750 used.
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I have been thinking of the APC H15 but I have heard that it makes an annoying, clicking sound when it adjusts the voltage. Anyone heard this?
Indeed it does - I suspect that this is a mechanical relay switching. Compared to the sound of the Air Conditioning switching on it is kind of a non issue for me. Mine is hidden away (closed cabinet) so I don't hear it but it is loud enough that you could hear it in a quiet room from across the room. FWIW: You can adjust the tolerance window on the stringency of the conditioning - if you were to find it happening all too often.