timothetoad said:
.....I should also note that I'm on a very tight budget. ....
Then there's only one right answer, EF 50mm f/1.8 II.
http://www.usa.canon.com/cusa/consumer/products/cameras/ef_lens_lineup/ef_50mm_f_1_8_ii
http://www.bhphotovideo.com/c/product/12142-USA/Canon_2514A002_Normal_EF_50mm_f_1_8.html
It's built like a toy, seriously, like Hasbro quality. Canon should create a marketing arm for these that sounds like a Western Pacific mainland cheap rip off, Canhoon maybe?
Cheap feel aside, it's got great IQ, fast focus, f/1.8 is pretty fast for low light, a more or less natural perspective, you can't go wrong with it. It just works and works very well.
50's were the "Standard" lens way back when, they've been made so long they've been rather refined for quite a while.
Working with a prime's limitations sure sharpens one's compositional skill set, zoom with your feet and all that that statement implies.
The 40mm Pancake is a little more money, has a very solid, professional build quality feel.
At f/2.8 it's not as low light fast as the 50mm, doesn't focus anywhere near as snappy as the 50 though the 50 is sometimes too fast and overshoots then hunts back.
The 40mm has an STM (stepping motor) for focusing that is both a curse and a feature.
The STM makes a groan/whine noise when running, non-mechanical and fully electronic focus goes to sleep rather quickly and then you cannot manual focus until you wake it again.
http://www.bhphotovideo.com/c/product/870179-REG/Canon_40mm_f_2_8_EF_Pancake.html