Back to the original question... yes get a zoom and a prime. Your prime should be fast but 1.8 is fast enough for most uses.Get the 50mm 1.8 and enjoy it.
If you want to expand get the Sigma 30mm 1.4 or a Canon 24/28/35 whatever, instead of a better 50mm.
Stick with the 18-55 kit lens or look at a 2x-7x like the Sigma or a Tamron.
Yes
Get my 40D with Sigma 18-50 Macro F/2.8 + Canon 50mm F/1.8 :lovegrin: