I recently purchased a Maptech Chart Book and it came with a Downloadable CD. Very basic system, Navigator Lite I think its called. But for $60 you get a chart book and electronic software, for me it was a great starting point. The electronic charts only cover what is in the chart book, very limited. But like I said a great place to start with out spending a whole lot of money. The lite system is very simple to use and has a lot of valuable info. I find it very useful.
Than I added a USB-GPS (which was discussed on an earlier thread) for around $60 and now I have a backup GPS/chartplotter on my lap top.
I am using Maptech, Navigator Lite.