The website is kind of smart since a lot of people don't know component picking, but if they don't know components. They don't know if they get components that may not be suited for what they are intending to use their rig for. So I think you should be able to, as an optional setting, set whether you are planning on using it as purely a gaming rig (in other words, an i5 and better graphics is what you need), but if you are looking for an editing rig an i7 and more ram and the graphics isn't as important (of course you need a card but not the top of the line.) And if you choose both, then you may suggest putting a bit more money in the budget if it's too little or something similar.

But other types of computers should be available with descriptions for those who don't know what they are, like HTPC's and media servers or servers in general. Maybe even a minecraft server, you might benefit a lot from having Minecraft server on there since the people wanting to set up minecraft servers nowadays don't know what to get...

If you want help with anything I'm more than happy to help. But I think you know what you are doing. But again, great initiative! I really think more people can build computers, they just need to get over the barrier of choosing the components.