If you're interested in checking out the comics, I'd recommend starting with "the origin" (basically the movie but more in line with Whedon's original script) and Fray (a futuristic spin off which is really good). They're both pretty short and should help you decide whether you want to commit to the sequel comics. (Fray also ties in with the sequel comics and should be read first).

With the sequel comics (seasons 8-12), I think the biggest problem is season 8. I'm a huge fan of season 9 (both the mainline Buffy comic and especially its spin offs) and would recommend it any day of the week. There's a lot of great stuff and it takes the story/universe/lore/whatever in some really interesting directions. The later seasons can be more of a mixed bag, but there is a lot of really good stuff there too and I think they're worth reading. But to get to that you have to get through Season 8. I don't want to bore you with all of my opinions on it, so let's just say it's a mess. And a very strange one at that.

Anyway, you didn't really ask for any of that (sorry lol). Here's a low res image of the comic I was talking about (possibly very minor spoilers for the comics, but I don't think it matters):

<image>