Audiophile newbie Part 2

I posted this thread not too long ago about equipment and things to consider for a young up-and-coming audiophile. Thanks to those you responded with helpful info!

I tend to be drawn towards digital media formats. And less towards the idea of vinyl. (Think scratches and dust and moving parts)

Questions:
What is your optimal bit-rate when playing a digital file?
What's your favorite way to send music from a computer to a hi-fi system? (USB?)

Thanks!