What bike size do I need?

There is no way i could ride the 'competative fit' bike as it would be way too small and prohibit using the drops, unless i wanted to bend my spine in an arc but then you wouldn't be able to move your diaphragm/breath properly.

You should learn to absorb oxygen via gas state osmosis, through your rectum, like a true roadie ;)

Its just a guide though. Personally I'd like to see a side-on picture of myself sprinting in the drops. To see how hunched up I really am. I can breath freely, but my thighs strike my belly slightly.
I may need to eat less pies, or do more miles. More miles it is then.