Note that if the sine wave coming in via your distribution panel is not clipped and has the typical distortion levels, you may not need a full regeneration unit. Rather a good EMI filter giving 50 dBm of attenuation from 10 KHz to 30 MHz and isolation will be more than adequate as well as saving you some significant cash.
The important factors to consider when purchasing a regeneration unit is looking at the harmonic distortion of the 60 Hz sine wave under full load, the worst case power factor, and load surge capacity in VA. Also, look for one that doesn't contaminate the earth ground, so medical grade isolation is preferred. I would also look for one that is designed for high end audio work, as fridges, lamps, heaters, etc. aren't too fussy about what the power looks like. Computers are fussy but not as fussy as audio gear.