A few months ago, I picked up the first volume of IDW's Ghostbusters ongoing, and pretty quickly realized that it was going to be one of those comics that I had to stop myself from just buying all at once, because otherwise I was going to blow through it all at and then be sad that there wasn't any more to read. That's how it became one of the comics that I get myself as a reward, a little treat to get me through the day. I hit my deadlines, and I get to buy some Ghostbusters comics.
You, on the other hand, should just go ahead and buy them all at once, because there's never been a better time to jump in. Almost every part of Erik Burnham and Dan Schoening's run is on sale at Comixology with the collections at 50% off, and if you love Ghostbusters as a movie, I can pretty much guarantee that you're going to love it as a comic, too.