I poured 24' of countertops for about $200. They are actually fairly smooth, Just has some humps and dips. If you take your time that would be easy enough to fix. Have help. I mixed like 14 bags of concrete by hand then carried and poured and finished it, its a lot of work. The cabinets are about the cheapest things you can buy but haven't come crashing down yet, that was about 3 years ago.
Basicly what you need is
Quickcrete high strengh concrete, cement board to cover the top of the counters, some wood to form the front and sides, a little duct tape for the seams on the cement board, and if you so desire coloring, mine are Terra cotta, all of this you can get at lowes or home depot. You will need some basic cement finishing tools, maybe a viberator (an obital sander in a plastic bag will work and away you go.