Paid lots of tuition fees in the past, and continuing to do so in the present and probably in the future.
I strongly urge you to consider the strength of the 50mm f/1.8 before selling it. A prime lens can teach you a lot about photography.
1. Learn in theory what others use it for. In this case, probably portraits, shallow depth-of-field, street shooting.
2. Go out shoot it, try the various things you learn from theory, books, net, etc. Let the lens teach you its limitations, and strengths. Next time you will know exactly when to use which lens to get that exact effect.
3. If you still don't like it, sell it. But then again, at $100+, why bother?
The reasons I am not running out to buy a 35mm f/1.8DX right now:
1. I have the AF35mm f/2 lens (I have D300 and D60 - no AF on D60 that I carry more often for size and weight).
2. Minister for Home Affairs and Second Minister for Finance says times are bad, better don't anyhow-spend. And "you have so many lenses still want to buy somemore...".
No worries, some day I will sneak one home.
The 10-20mm would be a big eye-opener for those not exposed to UWA. See this
http://www.clubsnap.com/forums/showthread.php?t=474066 for some UWA samples.
OT liao.