First, I recommend a Microsoft-based PC (or laptop) over other types of computers (like a Mac or Linux) simply because there are more options available and I consider them to be the optimal choice - and consider you are asking this question in a Vista forum where we are admittedly somewhat biased.
If you get a new laptop, then you will surely be getting Windows 7 with it (not Vista). The Home version should be fine - though you may want to add some supplemental programs (many or most of which are free).
If you intend to make audios and watch videos, you'll want to make sure you have a good sound card, a better than average graphics card, a monitor big enough for you to enjoy watching the videos without feeling cramped by a small screen, proper peripherals and/or connectors or adapters to create audios and hear them properly (meaning a good microphone, perhaps external speakers, and whatever else suits your fancy), and as much RAM as you think you might need and are willing to afford. If you intend to store these audio and video files (they can take a great deal of space), consider including a hard drive large enough to accommodate your collection - it's much easier to do this upfront than to convert to one later. They are relatively inexpensive. I can't recommend a specific size as I have no idea how much you intend to store - but you do so simply consider this when selecting.
Personally, I prefer Dell to all other brands (but you will get a considerable variance of opinion on this). Since Dell opened, every computer I've owned has been a Dell. I only recommend Dell to my business clients. I've never been dissatisfied (yes, I have had some problems, but fewer than with other brands) and their service is excellent (but be smart and get the extended warranty plan as the cost of service without one is high and the warranty often comes in quite handy not just for repairs (which they will do at your location instead of you needing to mail it in) but also to get free assistance from their technical support team).
Here is a web page from Dell where I searched for laptops specializing in Multimedia. I'd start there and then explore the options.
Dell Laptops & Netbooks | Dell.
If you want a
specific recommendation, I'll go out on a limb and start you here with what I would choose given your proposed usage and you can then customize it as you see fit:
The Dell Online Store: Build Your System. Yes, it is a little over $1000 (and possibly a bit more if you do much customizing), but not 1000s and it will last you for years and is designed with what you want to do in mind. If it's too expensive, then simply select a different make or model that better suits your budget.
I hope this helps.
Good luck!
