[nilkn]

Unfortunately making this site really, genuinely useful for the typical car shopper is going to be something of a monumental task.

The ultimate tool in this space, which would be an absolute bitch to make and keep up to date, would probably replicate, in a generic way, all the custom "build & price" apps that are on various car manufacturers' websites. It would let you save custom builds of vehicles, each potentially from a completely different vendor, so you could review and compare side-by-side your own custom builds, with pictures, packages, pricing, etc., all arranged in ways that are conducive to comparison. It would be great if you could simply share URLs with friends so they can see exactly what you're considering and give you feedback. Popular builds could be saved publicly and ranked and discussed by the site's community and more.

That is what I would personally envision as a sort of revolutionary tool in this space, but there's probably a reason it doesn't exist. It would be pretty hard to maintain a custom build & price tool that generalizes basically all the custom ones out there--and to then keep it up to date at that.