BIKES

Kim, when getting a tri bike for the first time I would advise that you go to a reputable tri shop and talk to someone in the know. Frame size is the most important aspect to get right before you start thinking about all the fancy stuff. Road bike frame size is very different to tri bikes sizing. Get the frame size wrong and no matter how much the bike cost you won't be able to ride it well. Generally, once you have the size right the rest is easy. Bikes in the market now are mostly made in small, medium and large and much of the adjustment for fit is done by positioning the seat and bars for leg length and torso reach. Saying that, not all frame geometry is the same so be mindful that some brands may have longer top tubes then other for the same size frame. In other words 2 frames the same size may have different top tube lengths meaning your reach may be of concern. Don't let all this worry you. Now days bike shops are up to speed with tri bike fit. If you can, try to find someone that has a bike you think you may be happy with and see if they would let you have a go on a turbo trainer. If it feels right then it is possible close to being right. You may already know this but the market does offer woman specific frames and generally the top tube is a bit shorter to accommodate a shorter reach.

I possible haven't answered your question but to be blunt, the fact that you see all the brands at races and athletes are riding them well means they are all good. You just need the right one for you, and not because the pros ride it.

Check out Tredz website. That may give you some good ideas.

I ride a Cannondale Slice. At 4 years old it is not as technical as the new models (of any brand). I can't fault Cannondale, it has served me well over all race distances. There are some design things that I don't like but you are unlikely to find the same issues on a new models. (seat adjustment for one)

Tri bike for Wimbleball is okay but if you can train on the route, use both and see what suits you best. Personally I found that you have more to gain from the areo position on the down hills and flats than you give away on the climbs. On the steeper hills you are generally out the seat so you are likely to go up at similar speeds to everyone around you.

Hope this helps a bit.