You can get the first version for under $100 normally. It's a great lens. I never had any issues with the bokeh from either of mine. You would definately prefer this lens over the 28-105 f4.5-5.6 you say you have. It will be night and day.
Actually I said I had the EF 28-135 f/3.5-5.6 IS USM. I find it quite good. The 28-105 f/4-5.6 is pretty poor. The 28-70 f/3.5-4.5 isn't to replace the 28-135, but to give me an option for a close-focussing, small, light but hopefully sharp zoom.
----Brad---- 


