Basically I'm looking to buy the Tamron 17-50mm f2.8 non-VC by the end of the month. This would replace the EF-S 18-55mm f3.5-5.6 IS that I sometimes use as my "walkabout lens". For portraiture, I always use my el cheapo 50mm or other lenses. To be frank, I don't use the EF-S lens much for anything else due to the variable aperture. I only need this range for personal/commercial events where primes would be severly limiting to me as I only have 1 camera currently.
Thus I would like to know... should I sell my kit lens after I've gotten the Tamron?