help with sizing

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Hey everyone,

I need help sizing a cross bike. I normally ride a 54 to 54.5 cm top tube but I have short legs. Is stand over height critical in cross. I need something with less that 76 cm stand over height. What top tube length should I consider? I'm 170 cm tall with

One LBS told me that stand over is not as important and the tt is more important but I need something with a 1 cm less that usual.

Brands that I have consider are:
Bianchi (52 cm and 48 cm)
Kona (48 cm)
Giant (sponsors, small)
Redline (shop sponsors, sloping tob tube 52 cm)

I've look at the european brands but they don't seem to fit well at all.

thanks for any help.