MacBook Pro vs Custom PC (or both?)

I have a 15" 2.8Ghz MacBook Pro unopened in it's box. That means I can go and return it right now for a full refund of $2,300 plus tax. I know a lot about computers and building them. I've wanted to build a computer for quite a long time, and it turns me off that Macs are targeted towards people who don't know anything about computers. The primary things I like the Mac for are it's tools for creative professional. Audio and music production is a hobby of mine and the Mac has garageband. To this day, I've never been able to find anything similar on the PC. I also like iWeb, because it simplifies the process of website creation without using free websites like freewebs.com Other than those things, I need a Mac for nothing else. I want a PC because, with the money this Mac costs, I can build a decent rig. Keep in mind, though, that I am not the biggest gaming freak, I have a life and friends, etc, but I do enjoy having expensive, powerful, overall badass hardware. I know that almost 90% of this site is made up of Mac haters, but please try to understand both sides, Apple and Microsoft. Now, I have a decision. I can open this Mac and use it, then wait about half a year until July, and in July build a PC with a budget that is undisclosed to myself, which poses some risk as to what the outcome could be if I take this route, unless the budget turns out to be even more than the price of the Mac and I get lucky. Another option is to return this Mac and use the money to build a PC right this instant. The drawbacks to this route include the set budget of $2,300 plus tax, which could be good for security of not dropping below that amount, but bad for the security of not going over. Finally, I could return this Mac and go without a computer until July, and at that point use a budget that is almost guaranteed to be over $2,000 and possibly into the $3000s and $4000s. The negatives of this pathway are obviously I will have no computer for about half a year and might constantly be bored. Also, I will have nothing at all to do during Winter holiday, the various holidays throughout the high school year, and a chunk of summer. The good part is that I will have a good budget to get what I please, and NVIDIA's 300 series of graphics cards should be released by then. Another random piece of info, I don't usually take my laptop to different places, which could be another lean in the direction of a stationary desktop. So, if you are not in a rush and have nothing urgent that needs to be done, please take a moment to contemplate this decision and assist me in making it.