if you're recording audio, PCs arent a bad deal. Adobe Audition can get you by a great deal combined with FL. I've recorded buttloads of demos and, after several years of learning how to play, theory, etc., I managed to pull out some decent quality demos. Mind you it won't always sound pro. IF you want the tech needed for that sort of thing, prepare to pay through the nose.
For laptops: whatever laptop you get. DO NOT GET A THINK PAD! I repeat. DO NOT GET A THINK PAD! Horrible laptop.
For Apple, I love using Logic in sound design class. And it's good for audio and midi. and i didnt know you can make it so the piano roll is similar to FL. That makes me want an iMac even more. Oh and for those who think Logic is overrated? Logic 8 has a killer library of sounds. even the lighter versions of Logic has hella stuff to play with. It's too bad I dont own it. I'd never leave the house.