generally primes are a lot cheaper than zooms, the following are all worth looking at
sigma 30mm 1.4
canon or sigma 50mm 1.4 or maybe the canon 50mm 1.8
canon 85mm 1.8 or sigma 85mm 1.4
once you start getting longer then that they get more expensive however those three would give about the same range as some zooms and you would have 1.4 or 1.8 on then all