Need advice on Audio Setup

What i want to put together is equipment for music which i can use to either:
-Listen music at home (Good quality)
-Use at parties (Good power)

Here's my idea of the setup:



I already have the Behringer mixer and the Acer Laptop.
What i need is amplifier and speakers. My idea at first was a used amplifier with speakers built by me. The thing is today i came across an LQP amplifier which costs very little and has lots of power(Costs less than the used receivers like 20 year old Technics or JVC). Since i already have the mixer, the both should quite a team i thought.

What are your opions about the setup?
DIY Speakers or store speakers (The power should be at 100-120w per channel)?
How is the quality going to be?
Used receiver(Less than 80w) or this LQP amp?
Am i going in the right direction?

Thanks for your time!

I forgot to mention that i ussually listen to minimal/techno music (dunno if that helps).

I finally bought the amplifier and tested it with my brother's sony tower loudspeakers. It sounds very nice.

I have to get a USB sound card because the one on my laptop is full of distortions. When there's no music there's lots of static.
Can anyone recommend a good usb sound card for a maximum of 50$?

That's exactly the one i was looking at, but i also found the UFO-202 which seems to be "better" at audio output. Any comments on this?