I have just begun to get hooked on DSLRs over the past yr. My wife had an XSi that I learned on before purchasing the T4i in June. I am looking to spend between $800 -$1200 on a new lens. I currently have the EF-S 55-250 IS, EF-S 18-55 IS and a 40mm STM. I mostly take pictures at sporting events, choir concerts (indoors with lower lighting), family events (holidays, weddings, graduations, etc.) and city landscapes.
I am currently looking at the 70-200 f2.8L non-IS, 70-200 f4L IS, 135 f2L. I am looking for a lense that would be good enough off a tripod/monopod as well as handheld.
With my lack of experience in photography, I want to make sure that I am considering all options, but want to rely on the expertise of people with much more experience than I.
All suggestions on other lenses are appreciated as well.