I have a short inseam also, i forgot to mention. about 27.5 or 28" even.
I test rode a jamis eureka the other day which was on sale... it's a closeout model and i don't think jamis make eurekas anymore... anyways, the bike seems to fit me real nicely. when i looked at the size it was a size 12. i wanted to try a 14 but they don't have any being the size 12 their last stock. from what i gathered the p's and the stp's are about size 14... when i tried them, i could feel the top tube underneath my jewels already. (sorry for the lack of vocabulary). so, you guys think i should go for the size 12?