4 RAM slots? How many do you need? I have a mobo with only 2 slots. And that's another thing: when you know what you need, you can afford to go minimum. For example, many mobos are over $100. Gaming ones are for $200.
Because I know that I will only use one GPU, and will only really need 8 GB of RAM, I was able to get a good motherboard for 50. The more you save in one section, the more you can spend on another.