i've no issues with 17-50, i love the range. which somehow has hindered me in learning how to use a prime. But i've an idea that prime has a better DOF.
I usually shoot around 30+ upwards.
I'm thinking of getting prime, then play around those creative shots, small hands on mine, & so forth. newborn.
Seems like 50mm might be a good choice.
hmm you can still use a zoom as 'prime', just fix the desired focal length by not touching zoom ring / taping it
and don't think DOF is affected by a 'zoom' lens. It's affected by aperture & focal length & sensor size
the creative shots you mentioned should be able to be done by your lens, unless you really wanna get close then you may need macro lens
so actually I think you can save the money and just use what you have
if you wanna buy actually the 30-60ish mm primes within your price range have their pros and cons, no 1 best lens... some of the lens I did reseach on:
Canon 28F1.8 - wider, but corners are soft, more expensive
Canon 28F2.8 - nah, just fix your zoom at 28mm
Sigma 30F1.4 - wider, brighter, but corners are soft, more expensive and bokeh is harsh
Canon 35F2 - wider, cheaper, lightweight but less bright, bokeh is harsh
Canon 50F1.8 - great price-performance ratio, light but may be a bit tight in small rooms
Canon 50F1.4 - brighter, but be a bit tight
Canon 50F2.8 Macro - can go close, great quality, but not 1:1 and not as bright
Canon 60F2.8 Macro - can go real close for details, opens up macro opportunities, great quality, but tighter and not as bright
(celebrating my 100th post ;p sorry OT)