If you're keen to find a telephoto zoom, then I'd highly recommend the
Canon 70-200 mm f/4L (non IS) - should be within your (extended) budget.
It's a very, very good lens that will blow the socks off all the other zooms you were considering.
You'd probably want to get a tripod collar ring too; the genuine Canon one is ridiculously expensive but you can get knockoffs pretty cheaply.