I throw newer heavy(175+) Z Comets for most shots in between my Wizards and Buzzz's. It's an excellent long approach and finesse mid. Flies straight when thrown flat and still fades out.
If the Comet isn't what you're looking for, try a lighter, domier, D, X or ESP Buzzz. I like 177 Buzzz's but also carry a 170 ESP that's thrashed but holds excellent lines at slower speeds that my newer heavier Buzzz's can't. I suggest D, X or ESP because in my experience those are generally the more understable Buzzz's, also they get soft and floppy when beat so you can drop accurate shots in the putting circle without a skip.
Last but not least the Zone is like a mini-Buzzz but only in the way the rim feels, it flies much, MUCH more overstable, however I had success beating a Pro D Zone into a pretty darn straight flyer with some good seasoning.