OK Mr Trotter my advice to you would be (in order)

1) Get the right size bike.

2) Probably get something that allows you to be in a forward position.

3) Find a postion that is as aero as your body allows comfort wise.

Once you have the right size bike (and by all means save some dollars by shopping on line but only buy online when you know exactly what you need in relation to point 1.) Spend some of that extra money you saved by getting a proper bike fit done by someone that knows what they are doing. Be warned - this may not be too easy - I would ask others on this forum if they could recomend a good fitter in your area. I have seen bikes set up for Ironman before by supposed experts that I just couldn't believe. ie aerobars higher than the seat.

As for online retailers - I live in Western Australia and buy most of my gear from www.totalcycling.com who are in Ireland. Fantastic guys, great service, often world best prices and best of all for you, you will be able to understand their accents.

Proper fitting is #1. If you don't have a proper fitter, and you are just trying to guess...get something that has a wider range of acceptable positions at each size...Cervelo, Titan Flex, etc. PRACTICE your new position as much as possible before the ironman...that's too long a ride to fake, and if you're not comfortable, it can be a really long day. Best of luck to you!

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Quid quid latine dictum sit altum videtur
(That which is said in Latin sounds profound)