The reason you should buy a Mac.
http://www.apple.com/logicstudio/logicpro/It's a sequencing/recording program that works with midi, audio, and loops. It gathers all your soundfont sets and software instruments (like MachV, Garritan's Personal Orchestra, Garageband's sounds, Reason, and the ones that come with Logic, which are awesome) into one context menu ahead of time so you don't have to search around. Basically, the entire program is streamlined like this in every facet of its use and operation, and it is incredibly easy to use.
I recommend it over Digital Performer, ProTools, or any other program like that out there.