So I did a little testing and want to post the results I got (if anyone wants to put it into an easy to read graph that would be great).
So I measured the voltage out of the wall socket at 118v which goes to my 3,000 watt step up voltage converter/transformer.  Out of the step up converter/transformer it measures 230v.  I've got my APC Smart-UPS 1500 (1,000 watt) sine wave (230v version) connected to that (which I measured only uses 1 to 2 watts when the battery is full).  Also have a 5 port switch that measures about 1 watt of consumption at idle connected.  The ThorTech Thunderbolt Plus 1200 watt power supply is connected to that and the pair of AntMiner S3+ are connected to that (the display is showing that the power supply is running at a 92.77% efficiency).  So the measurements on efficiency and power are for the pair of (batch eight) S3+'s working in pair and mining for at least 5 minutes at each speed before the measurements were taken (225M and 237.5M were taken after 1 hour).  Note that the case the AntMiners are in has 6 additional 120mm case fans as well as a fan controller (at about 2w per fan, that's 12w plus whatever the fan controller uses that should be deducted from the rating below from the pair of S3+'s).  The wattage measurements fluctuate so I took the closest average.

Speed:          #1  (GH/S avg)     #2           Wattage at the wall           Wattage after the Step-Up C/T(230v)        Wattage after the power supply 12v (for pair of S3+'s and 6 additional case fans and cont.)
250M            486.62              499.42                  928                                         877                                                        825  (412w ea.)
237.5M         481.25 (489*)   479.21 (470*)       870                                         820                                                        778  (389w ea.)
225M(S3+)   450.55              448.46                  818                                         774                                                        725  (362w ea.)  about the 355w claimed after deducting for the 6 fans (but they claim it at the wall, which means they're off by approx. 25 watts each).
218.75M(S3) 438.89              438.95                  790                                         749                                                        700  (350w ea.)  about the 340w claimed after deducting for the 6 fans (but they claim it at the wall, which means they're off by approx. 25 watts each).
212.5M         428.44              414.86                  765                                         725                                                        676  (338w ea.)
200M            407.21              411.31                  717                                         679                                                        630  (315w ea.)
193M            390.32              387.29                  697                                         658                                                        610  (305w ea.)
175M            342.16              356.92                  630                                         595                                                        548  (274w ea.)

*(online pool stat: Average hash rate in last 60 minutes. Calculated each 5 minutes.)

Looks like I'm going to underclock a little 3 S3+'s down to S3 default speed of 218.75M on a EVGA 1300 watt G2 power supply for my next rig for about 1,050 watts at the power supply.
Here's a little odd fact I found out this weekend, when I set up a pair of S3+'s (at 237.5M for the pair) with a Corsair AX1500i Titanium power supply on the same power set up as above and only 4 smaller case fans, the wattage was about 20 watts MORE.  This shouldn't be as the power supply is Titanium rated and set up is closer to the 50% load rating.