Making The Switch From Pc To Mac Options

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Hi everyone. I have been considering switching over to Mac for audio work, starting out using Garageband. I've done some research on the net, but there is one thing that is nagging me. I have a custom drumkit in gigastudio format that I am absolutely in love with (I've worked on it for years, it's incredibly realistic). Is there any way to either convert this to a software instrument, or barring that, a way to create your own software instrument using the samples of each drum/cymbal in the kit? Or am I just going to have to bite the bullet and use the built-in kits or the percussion jampack? I know you can hook up the pc and mac and use the pc as a dedicated gigastudio machine, but that won't always be possible (transporting the mac from place to place). Thanks in advance for any info!