What kind of bike should I buy to participate in my first triathlon?

[doddster1974]

I am taking part in my first sprint triathlon in June. I have started my training but need to buy a bike. I am female, but I prefer a man's bike. Would this be appropriate? Can I use a mountain bike? Can you recommend a make and model? I don't want to spend too much and may even try and source a good second hand model. Also I'm 5ft 5", what size bike will I need? Thanks!

 

[mic]

A motorcycle