I think you'll find that the quality of construction of a component is the most crucial... and unfortunately there's no spec which defines that. Like a "glue" rating, for how well joined a speaker is hehe. I wish it exists but it don't.
Audition a whole lot of speakers, both within and outside your price range, then pick the speaker you want and save for it. If it's like $5000/pair, well, maybe that's a little outside your price range... so be realistic too. But if your favourite pair of speakers costs $250 then buy them
Realise that build quality determines how well a speaker sounds.... I could build a speaker with gold voice coils, carbon fibre cone, etc.... but since I'm putting it together, it's not even going to produce anything more than distortion. Your best bet is to hear a whole range of speakers, pick a few that you like, come back here, post up the names, and ask what people think of the 3-4 brands that you're considering