OCR refers to the frame shape. All OCR have essentially the same geometry. The number 0-3 refers to the components on the bike. 0 being all dura-ace and 3 mostly 105. The final difference is whether the bike is "comp" or not. If it is comp (composite) that means the frame is all carbon. If it is not, it's aluminum.
Hope that clears everything up.

As for me I have the TCR comp1 which has a more aggressive geometry. Comp 1 still means the same as it does for OCR. I am 5'4" with 30 inch inseam and I'm on an XS. I LOVE it.
The difference between WSD and men's is essentially the top tube length. It is shorter for women because they supposedly have long legs /short torso, while men have short legs /long torso. Relatively speaking of course. I happen to have a man's proportions, so WSD doesn't work for me.

Hope this helps. I will say that part of the reason I LOVE LOVE LOVE my giant is because I have a mix of ultegra and dura ace. So my opinion doesn't necessarily apply to a "3".