I would have voted D7000 as the best, but if you preferred the size of your D40x to your D80, then it seems to me it's an easy call for the D3200.
The D3100 might save you a few bucks and if you're only web posting then its (14MP?) is plenty. If you have any aspiration to do prints, however, I'd go for the D3200. The cost of storage space and processing power is so minuscule, I consider it to be a non-issue and certainly not worth all the hand-wringing it generates.