Help Me with Which Lights to Purchase

i have galaxian 3d , love it, but that alone is your entire budget

i'd wait for micro galaxian, as it will be 1/3 of the cost

also, i have Revo4, love it, it covers the entire dance floor, depending how high you go with it...

i would recommend you check em out at the stores, if possible, before buying

When working with a limited budget you'll want to look for the best 'bang to buck' lights that you can find. You'll also want to find lights that have many different features so that they'll stay fresh during the 4 hour gig. I'd agree that the Revo 4 is a solid choice for you because it gets wide coverage and has a nice set of built in programs. Assuming you plan on leaving your show on sound active mode, this light should work nicely.

I'd avoid the laser myself. Though they're pretty cool, I think lasers such as the galaxian 3D wear out very fast (in terms of effectiveness). When I'm able to use fog and high power lasers at a venue I only use them for maybe 5 minutes during the 4 hour dance. For the 5 minutes they're on it's an incredible effect. I only run them for a few minutes because I don't want their effects to get old. Since you can only get a few lights I'd hold off on the laser.

If you can get a second light I'd suggest something along the lines of a Jellydome or Vertigo/Aggressor TriLED. Though not as versatile as the Revo 4 these lights will add some physical movement to your show. These will look good with or without your Revo 4, so it'll give you some nice combinations of effects to play with.

Hope this helps, but yeah, try to see if you can get a live demo so you can pick your favorites!