What is meant by 'vintage'? Are Snell Bs old enough to be vintage? IMO they were the best speaker Snell made. They go down to 22Hz and are easily driven with 60 watts, although I found 200 watts to be a bit better :)
One a budget the older KLH speakers are very nice if you get one of the bigger models.
But one problem you will run into with vintage speakers from the 50s,60s,70s and 80s is breakups, which contribute to harshness. The KLH speakers I mentioned have a problem with this in their tweeters- you push them, they get harsh. But if you're unconcerned with keeping them original, there are newer tweeters like ribbons that have far better performance. Of course you may be spending more to fix that problem than you spent for the speakers themselves...
BTW the kind of music you like has nothing to do with whether the speaker will be appropriate or not. The requirements a speaker needs to be good at rock are exactly the same as what it needs to be good at classical or folk.