Based off of my experience, I would go with a Lynx Express. They are decent controllers for a decent price, however if you chose to buy from a group buy at www.diylightanimation.com, you will need to solder the board (not sure if you have any experience soldering or not or if you'd be willing to learn). However, as garyh mentioned there are a lot of people who buy and sell controllers on the forums, keep an eye out and you might be able to get an assembled board for pretty cheap. If you wish to grow your display, you can always add on or upgrade in the future when you're ready.