Computer Build Tracking

So I'm looking to create a website that helps novice builders (and even the more advanced ones) find parts that will interact well with each other. I just finished my third computer build in my life and I remember every single one was rife with worry that either the memory won't like the motherboard or the power supply might not be suited for the machine or... well, you know. Perhaps that's part of the fun, seeing your OS logo pop up after all that stressing, but I wanted to see if I could whip something up to ease these pains.

Laid the DB foundation, created a UI, started working on some of the other various elements of a web project, and now I am interested in adding a feature that might be very helpful - some sort of external product database.

What I was hoping was that I could find a major retailer with an API to lookup product information with proprietary product codes (ie... http://api.tigerdirect.com/product/S190-5295.. which is not a real link). Anyone know of any services or retailers that maintain some sort of up to date API like this? Or any other solutions?