Sony's Sonic Foundry (or is it Sound Forge? I've never quite figured that out). It's not quite totally top-of-the-line professional stuff... I'd say it's halfway between completely professional software and Audacity. I use it to record voice acting and produce/remix music. I'd buy Linux software, but as I've already got Windows software that does what I need it to do, I don't see the point in spending more money, since I am going to be dual-... forgot the word. I'll have both OSs installed.
Looks like it actually work with Wine... more or less. May need some fiddling, may not work for you no matter what you do, but it's worth giving a try

. Check out other people's experiences on http://appdb.winehq.org/objectManager.php?sClass=application&iId=529.
Depending on your hardware, technical knowledge, and some other factors, you might be able to get away with running it in a virtual machine. Downside would be a greater loss in performance and potentially more messing around to get it set up, but the upside would be running it native in Windows (this is also dependant on you having a spare Windows licence you can use for it, if you're still dual-booting). However, virtualisation is probably as big a new thing to you as GNU/Linux, so I don't expect it'll be a viable option just yet

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As an aside, have you got a preference between Ubuntu and Mint?
As someone who has been using Fedora exclusively for the past several years, I'm probably not the best person to judge them. But I like what I've seen of the attitudes Mint's developers seem to have, and my largely gut-based preference goes to it

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EDIT: A quick search came up with http://www.wikivs.com/wiki/Linux_Mint_vs_Ubuntu, which may help. Wikipedia also has a http://www.wikivs.com/wiki/Linux_Mint_vs_Ubuntu.
Trivia: The term "boot" (as in "Boot up that computer, will you?") comes from the idiom "To pull oneself up by one's bootstraps", which means (figuratively) lifting oneself up without help -- which a computer does by loading a simple piece of software that loads a more complex piece of software that starts loading the OS which then loads all the bits and pieces it needs to run.