If I am not mistaken the dynatek is actually made by Dobeck, as are several other popular brands. Don't pay $215 for it. You can find used Dobecks for $100 shipped. I have personally purchased two from folks here on this site. I have both a Dobeck and a PCIIIusb. I like them both. If you are going to do just the 3 mods. Save yourself some money and go with the Dobeck. You will never feel the difference anyway. Now if you are going to get into your engine eventually then you might as well spend the money now and get the PC. It has the adjustability you will need with more agressive builds.
If that's all you are buying is a fuel controller, then there are probably better and/or cheaper. I got mine cuz it was part of a package and they(CT racing) pre-set it and said they had good results with it. I don't plan on doing more engine work to mine, so it will suffice. I did notice that you need a small phillips screwdriver or something to adjust it with and the adjusters are plastic, so I could see them getting stripped if your not careful.