Stick with canon lenses for now, you don't need to step up to cinema quality lenses that cost 1000s of dollars.
There are a bunch of threads about lenses, but good quality lenses have a fixed aperture, aka no 3.5-5.6 bullshit and are at least f4 for zooms and 2.8 for primes. Canon also makes "L" glass which is much better than normal canon optics.
Check out a tamron 17-50mm 2.8 NONVC, canon 50mm 1.8, sigma 30mm 1.4, sigma 10-20mm 3.5-4.5 (ONLY LENS I WILL EVER RECOMMEND THAT HAS NONFIXED APERTURE) tokina 11-16mm 2.8 canon 70-200 f4L (or 2.8 if you wanna spend cash) canon 24-105 4L and these are just to name a few. Buy a lens based on if you want wide, normal or tele and then based on your budget.
"she spins left because she has no rights" - Su[G]ar