These days, almost ALL ADJ lights are able to "run all night", which is great, because that means no more duty cycles(period of time on, followed by a period of time off).
You'll want to look for 1 thing: High-Tech FX. Make sure it is sound active.
If you're looking for control in the future, you can either hook these to power packs to control via DMX, or you can buy fixtures that already support DMX, but that's gonna eat into your budget fast.
Some dimmer packs have built in programs. The ADJ DP-DMX20L DOES not support sound active, but has lik 99 patterns to choose from and a variable speed setting.
For your budget, AVOID trussing, it's gonna eat over half your budget at least. A single dimmer will be over 1/3 of your budget. A controller? 1/3 to 1/2 your budget easily. You're better off with trees.(t-bar on a stand).
The budget is unfortunately really small and is going to severely limit you. It's just a fact. That isn't to say you can't get some cool stuff for that money either.