Looks neat. Somewhat similar to the spreadsheet(s) I have around for figuring out what chip breakdowns I'd need.
If I actually had the time and motivation, this might be something I'd be interested in making as a standalone app (and something to motivate me to learn various Windows UI programming, possibly GTK so it would work on different platforms). I'm sure it wouldn't be anything too complex, but with the majority of my time split between work and school (and sleep) I just don't think I could do it.
I think I spend too much time fiddling with numbers just to figure out possible chip sets

Not that anybody here would think that.