The difficult thing is you really should listen to many, many speakers and find what you like.
I'm all for DIY, but don't recommend building/buying something you've never heard before.
Best part is if you take some of your favorit movie/tunes (and make sure it is a decent recording) auditioning speakers can be loads of fun. You can listen to speakers costing thousands of dollars a piece to get a taste.
Then you can listen to speakers in your budget and decide what you like. They all are very different.