Seriously? I'm baffled why you're pushing him towards the kit lens. It's it nearly common knowledge that the kit lens is pretty much a throw away lens? I do get what you're telling him to do but it seems as though he's pretty much set on tossing it.
Yes, it's a cheap lens, and it feels like it. However, it's sharp. The previous 18-55 mm kit lens was
very sharp, and the newest version that was released a couple of years ago should be just as good, if not better. The main issues with the lens are probably (still) related to the lack of special coatings, the risk of seeing flares, aperture and low-light issues, etc.
I'd agree with compuwar that if the OP is having trouble with sharpness, then perhaps he should find out why. I wonder if the OP occasionally gets sharp photos with the kit lens?
If he does, then I doubt it's the lens. A lens that isn't sharp would never be able to take an occasional sharp photo.
Anyway, depending on where I'm walking (outdoors, indoors, tight spaces, etc), I'd either walk around with my Sigma 24-70 mm f/2.8, or my Sigma 30 mm f/1.4.
The Sigma is OK, but I wonder whether the newer Sigma 24-70 mm HSM version is a lot better at 70 mm? On my version, the lens is quite soft wide open at 70 mm.