No evil villain would be complete without their own a badass raygun, right? Or in this case, a Goliathon 83 Infinity Beam Projector. No, it doesn't actually do anything. Yes, it costs $621. But the looks you would get bringing one of these to an NRA rally... priceless.
The Goliathon is produced by Weta Workshop designer Greg Broadmore (prop designer for LOTR and Hellboy) and looks like an amazingly crafted artifact caught between the universes of Barbarella and Brazil. It comes with its own velvet-lined case (which it will probably spend a lot of time in, seeing as the gun weighs more than 7 pounds). If the Goliathon isn't quite to your liking, you can also take a look at the Manmelter 3600ZX Sub-Atomic Disintegrator Pistol or the FMOM Industries Wave Disrupter Gun--all three are each limited to a run of 500.
For those who just like to look (or may want to try and craft your own) there's also this great gallery of handmade prop rayguns created by Clayton Bailey from retro scrap parts.