Well what are you looking to spend for the speakers and how sort of quality are you looking for? (Audiophile hi-end stereo/surround listening, mid-range quality, basic/entry-level value priced speakers...)
Also, are you looking to just replace any stock speakers? In which case what sizes are the current ones (if any)? That might limit your options there. If not are you looking to get car audio type speakers and building custom enclosures for them, or buying more home theater type speakers (like bookshelf types) and mounting them?
Each person is going to have an opinion on which brand is best. In your case I would first decide on what type/size/style speaker you want and then look at and compare the brands available. Also think about how you'll use the system.....I don't know what kind of amp that is, but it looks like it's a surround sound (5.1) ch amp? So if you're planning on having surround sound available for movies you'll need to put a little extra planning into where you put the speakers.
So share a little details on the setup and then see what brands have speakers available in those styles and get opinions on those. But at this point it would just be one person saying brand X is better than brand Y, with someone else saying that brand Y is better....