Something that's good all around the spectrum
I listen to Hip Hop, Radiohead, Pink Floyd, Enya, jus about anything really
or you can get something like this instead of the receiver, but you'd have to to get an active subwoofer with a built in crossover. And you'd have to split the line out from your source, though that's technically not optimal, but it might be negligible in practice. No input on its sound quality though. And it might be too weak for big speakers. There are more similar options.
just search for (stereo) speaker amplifiers.
Bookshelf speakers or monitors plus separate sub are definitely the way to go.
If you're planning to listen to the speakers from a far place (and not at your desk), make sure you don't get nearfield monitors. Actually, it's best to not get monitors at all, since they're designed to project sound towards a specific spot. Not that they sound bad from far away, but still, you lose out on the detailed sound.