My first Chanel bag was CC Filigree Vanity Case/lunchbox. I don't regret my choice, and I'm actually looking to get the same style but different color and bigger. I still don't own a classic, and I don't want to.
If a classic is a must for you, and you'll kick yourself if you wait 2+ years and the price has gone up a lot, then I would get a classic. If it's in the back of your mind as a "want," but you aren't actually actively looking at it, then don't get it. If you end up getting every other Chanel bag, except classics, well it just shows the classic was never a true "want" for you.
Buy what you like and enjoy. Don't worry about people's thoughts on getting a classic. The most important thing is how you feel about the bag, not what other people say and think. Think about it this way, if there was only one classic and one of the bag you like left in the whole world, and I bought the black/burgundy bag, how would you feel?
Now if you regret your choice a day or years later, it's ok. We've all made bag choices we regret. Sometimes it takes a purchase to make us realize what we really want. Sometimes the bag doesn't work with our fashion. Sometimes it doesn't work with our needs and lifestyle.
I totally agree with this, especially the part about a classic being a must for you. Don't feel like you HAVE to get a classic because everyone says you have a get a classic! However, if you feel like having a classic is very important to you, then get it.