Another option that you can consider is the Vivitar 70-210 Series 1 Zoom. Back in the early 90s I paid well over $200 for mine but they go for much, much less now. The early versions with the f3.5 aperture are extremely good lenses. I worked with just that zoom and the Pentax 50mm f2 for a good many years before I could afford anything else.
This is a recent example that is going for $31 with shipping. http://www.ebay.com/itm/VIVITAR-SERI...item3cce299ec6