Tejano, I agree. Some of the most comfortable bikes I've owned are ones that I can't stand over, because they have best combination of top tube length and saddle to bar drop. I cannot ride road bikes that are too small because I have to jack the saddle way up and I'm not comfortable reaching down that far to the bars.

To the OP - don't base your choice on standover height. How tall are you? You might prefer a 650c bike, but don't try putting them on a bike that was designed for 700s. Your bottom bracket will be too low and you'll be smashing pedals around every corner.