Logic runs very nice on a new Mac as you'd expect, certainly better than the other DAWs.
Get as much as you can afford, forget the storage size as you can get an external drive at a later point and personally I find limitation to be a good thing.
Although not as taxing as video production music production software does put a fair strain on the machine especially if you tend to have lots open at once, for this reason i'd get as much as you an afford.
Minimum 8gb ram for certain, I used to get over 6 on my old 2010 machine and that was usually limited by the cpu before ram, it will utilize the quad core fully(not sure other DAWs do in osx), hd space isnt that important imo, if you get the 8gb you get 256gb as standard which should be workable. The ssd in new machines is rapid though.
Is there no way you can just get rid of bootcamp?, isnt much you cant do on osx now and it would make the whole experience a bit nicer. Guessing you use osx for the music side, Office is decent on these new machines, I just pay £5 a month or so. I hear people say Windows is better for gaming and office is slightly better although on a new Mac Office runs great.