Also how is the power consumption for these units - i.e. can you run them off the same 15 amp circuit w/o any problem.
Power consumption is low - no more than four amps for the pair - Since the speaker and amp are matched they can design them with momentary gain reduction so you don't get crazy things happening if you overdrive them (like a fuse tripping).
Genelec, PMC, and ATC active three ways all play loud with tremendous dynamics/punchy sound and all have a following. It is really a personal thing so I could not guess which you will prefer - for example PMC has more bass whilst ATC is more forward in the mids - take your pick. At this level of investment a trip is definitely worthwhile to hear at least two of the three....after all you may not even like the forward punchy sound of these actives (fatiguing some would call it) ...although I grant you that Genelec 8040 appears to have garnered your interest and they are fairly neutral - but there is a huge step up from these small monitors to a bigger three way active - if you have not heard it then play Sheffield Labs drum track loudly at your first chance of a demo and you will surely be gobsmacked.