It looks like I'm pretty similar to you, but one size smaller .
My race bike is a Ruby Pro too!- in a 44cm.

I recently aquired a TT bike used through Craigs List. It's a Quintana Roo 48cm frame. It does have 650c wheels - at my size (I'm 5' even with longer legs than arms so I need very short top tubes) the head tube can't be short enough on a TT bike to get any drop at all with 700c wheels and no drop = no good aero position. I was lucky and suprised to find that the 48 cm Quintana Roo actually has a short tt than my road bike. It's about as good a fit as I think a little person can find.

As you probably know the Ruby has 700c wheels in all frame sizes and for my road bike I really wanted to keep it that way. 650c's are just so much more of a worry for road racing, but I figure with a TT bike if you get a flat it really doesn't matter cause its all over wheel change or no wheel change. I haven't noticed any handling differences or problems and I'm thinking that another advantage to 650's on a TT bike is that I'll be able to get some nice wheels - disk, tri-spoke, deep section, pretty cheap. Lots of guys got bikes with 650's for Tri's and have now decided that they'd prefer bigger wheeled bikes so there are some good deals to be had out there.

Good luck with your search!