What are some good speakers to get for DJing at like a house party?

These would probably work well:
APX Power-Pro

Well there are many good speakers on the market to choose from. But if you do some research here and on some other DJ sites, you will find that people are greatly impressed with AA's APX series speakers. For convienience the APX Power Pro's are one of the best value's in the industry. The APX-152's would be a better choice if you already have a quality amp, and would like some greater flexability.