I just want to add that, as a newbie who has chosen the Comet as my central midrange, I don't think the disc is unworkably touchy: it definitely takes some getting used to, but if anything, it's probably an easier disc to learn as a newb than after playing for a year or two and establishing flawed technique. Although in the interest of full disclosure, I've only worked with Z Comets, which have the reputation of being slightly more forgiving.
I've fallen in love with the Comet. It does well at lower speeds, meaning both that you can use it at a variety of ranges, and you'll get the most bang for your buck when you do drive with it - I can hit 250'+ with mine pretty regularly, and I don't exactly have a cannon arm (often times, in field work, my Comets will match or exceed my drivers, which I'm still learning the proper technique for). So I actually find it to be very beginner friendly, in that it maximizes your distance and it is very versatile. It also makes turnover shots, which I'm finding to be some of the most technically challenging shots for BH, relatively easy.
I've heard great things about the Buzzz too, of course, especially how forgiving it is, but I just wanted to say that in my experience, there's no reason to fear a Comet's "touchiness" - it's been a great disc to start off with for me.
Edit to add: Of course, with all the varied responses, it looks like you're just going to have to make up your own mind where you want to start!