You're not missing anything from the mac World I will say you're if one day they decide to make all the same games you can play on the pc and stuff but not going to happen anytime soon... I would go with a PC with Windows 8 Pro Retail or OEM. since I always go with the latest operating system since I don't like being behind in the tech world. enjoy your new PC... hopefully one day Apple will be ahead of it's game.
For Apple they're setting themselves up as the Sony of the United States and you're a professional you'll just have to get used to playing second fiddle to the i-device hype. I think it is a smart move by Apple but equally if you're a Mac user expecting 'more' than what you've got today then expect to be bitterly disappointed. Don't be surprised if the Mac Pro is mothballed and the iMac is eventually killed off so that in 12 months time they're a 100% pure mobile company selling iPhones, iPad's, MacBook Air 'Retina' devices - that is the future of Apple (which will be very profitable for them) so the question is whether what you need to do lines up with their future path.
I'm not bashing Apple - I'm actually praising them for making a savvy business move but I do think that many Mac users need to wake up and realise that Apple is going in one direction and that new direction isn't going to line up with what they (as end users) want to do in the future.