See if you can find a version 1 of the 50/1.8. The II has a plastic mount and is flimsy by comparison.
Ditch the tele lens. It's long, but slow and the quality is really poor unless it's stopped way down (IE, tripod use only). I'm a prime shooter (and a pro, FWIW), so I'd skip the kit lens entirely for a used set of primes (28-50-85 to start, 135 later if you need it). Primes are lighter, smaller and produce L-zoom quality without the pricetag.
I spent a lot of years yearning for the next best thing in lenses, when what counts is the image and your application. I got to looking past the red stripe and focused on quality for what *I* was shooting, and fast primes are it. If you're looking for a walk-around kit, a 28-50-85 will to 90% of what you'll be shooting without doubling up on focal lengths like the 18-55/50 will. For things like birding, sports and other telephoto applications, the low-end zoom just won't cut it as a portable solution.
Check KEH for used pricing (they offer a warranty). Buying new equipment makes way less sense if you're not able to write it off as a business expense.