hello,
I agree with the above also and say that the sierra program ain't too bad considering its only $40. i got my copy at costco with a rebate and paid like 10 only.
I have some problems with it though, as when you start getting into very complex pictures with lots of plants it begins to slow down, lock up occasionally. As with most programs, save, save, save, so that you don't lose anything major. I think most of my problems are with my computer (only a 333). It was like top of the line when I bought it and now.........a piece of junk.
I've been looking at others, and think the DIG is the way to go, as it has many more features. However, if you are interested in trying the programs out, the sierra will get you started and is a Cheap way to go till you get to the point where you need more.
I've been using a combination of Intellicad(a cad program), autocad light 2000, and sierra photo designer (the site plant option sucks I think on the sierra) for designing, along with hand rendering.
steveair