Hi, I'd like to second the recommendation on the JBL Soundsticks II, which I use with my Intel iMac. I listen to classical, vocal, jazz, blues and folk for the most part, along with some rock and pop. I have listened to various Bose products through the years, and own a pair of on-the-ear headphones (non-cancelling) that I like very much. However, I find their speakers' bass too strong and not terribly adjustable for various recordings. I prefer a more 'transparent' sound, and the JBL's provide that. The subwoofer is strong, clear, and presents the bass lines in a fully and as loud as I may want (which isn't full out: I'm not the kid in a dorm anymore ;>) ... )
I bought the ones I using six months ago for around $120 at J&R. I'm sure other retailers are discounting them as well.
Good luck and happy listening!
Bruce