While I have a PC setup, I would recommend going with MAC if you have the option of starting from scratch. MAC OS is just more stable. Why deal with the PC headaches (drivers, patches, compatability issues) if you don't have to. Only downside is that Mac with top end audio software will cost you more in the near term than PC. But you will more than likely have the more efficient platform going forward.
That being said, I am enjoying using my PC laptop with JRiver and JPlay.
That being said, I am enjoying using my PC laptop with JRiver and JPlay.