Personally I would only bother with a mac if I was in an industry which used mac only applications. Since im in the field of 3D/2D design, a mac is not an option because of the limited scope for 3D development applications. If however I was in the music making buisness I would definately opt for a mac, as the range of software available is better than that on a PC
From the sounds of it you dont need the specialised software that a mac can offer, and therefor I wouldnt waste your money. If however you want to sit in starbucks looking ultra, ultra cool, get a mac... For the sake of you not having to sit and figure out all the foibles of mac OSX, just stick with Windows. Windows 7 is brilliant as well, if you get a decent spec laptop its a dream to work with.
Thats my thoughts on it anyway