I'm about 5'3 or 4" and have had a couple of Inbreds (very similar geometry to the 456) and just keep coming back to them. I have the classic woman longer legs, shorter body and so the tt is a bit on the long side, but I really don't mind it.
I run a 60-70mm stem (depending on set up) and find it great for chucking around. On paper it should be too long, but it seems to work.
It's difficult to quantify why I like it so much, but it's just a really fun little frame. In fact, when I had one set up ss I ending up choosing it over my beautiful (and much more 'fitted') Ti geared bike even when riding trail centres...
It's also very versatile as I currently have my set up as a 'bimbling around with a bump' bike for popping to the shops and stuff.
What fork are you thinking of building it up with? As my only thought would be maybe to go for one of the (slightly less stiff) inbreds over the 456 as it might be a bit better suited to a shorter fork/commuting duties and be a tiny bit more forgiving? I haven't ridden the 456 though so can't say that for sure, but I like the idea of the inbred more.
Still, I doubt you can go wrong with either as like people say they're so cheap, it doesn't matter if it doesn't work out. They often go for about £90 on here secondhand, so it's not a major risk...
