which road bikes...

[Eden]

I'd suggest looking at touring models as they generally have longer than average top tubes.
Like the Trek 520, or the Kona Sutra (both steel) - the Sutra in a 49cm has the same tt length as the Jamis in a 50, but 5cm less stand over.

Remember also that you can tweak the fit too. Most small bikes come with a fairly short stem. You should be able to put on a slightly longer one without messing up the handling, but remember that it is complex. You also want to be sure you can get good knee position, so the length of the cranks makes a difference too - smaller bike w/ shorter cranks means you'll have the saddle further forward - moving you closer to the handlebars again. If you are a hard fit, try to get the store to work with you and swap out components until you've got it ALL right.

I have to say I almost wish I had that problem - few bikes have a short enough tt for me..... (longer inseam than Mr. Silver on me, but only 5' overall)

Also cyclocross bikes usually are a bit longer too - but are often fairly tall as well. You can make them fine road machines with a swap of tires though.