Road bike recommendations

hey all,

Long time no post.

Well I have finally accepted that my long suffering right ankle will no longer suffer the torment of long distance running, unfortunately my body/mind still has other ideas thusly i am thinking of adding to my existing squad of 1 singlespeed commuter by getting a nice road bike for long rides with a view to getting into a bit of racing and/or triathlon etc as I can still thrash a fairly decent 10km running time and not drown and at heart I'm still a dumb-ass competitive male...anyway this is a very longwinded (i.e. justification-ary) explanation for asking whether I would be stupid for considering something such as this (CAAD10):

http://www.westbrookcycles.co.uk/bikes-c5/road-bikes-c18/cannondale-caad-10-105-team-replica-road-bike-2012-p199751

or for another £300 in dura-ace...(I know for sure I don't need dura ace but the price diff. is pretty minimal considering):
http://www.cannondale.com/gbr/2012/bikes/road/elite-road/caad10/2012-caad10-1-dura-ace-19991

I am moving to Australia at the end of the year and things are always way more expensive down in the antipodes so thought it may be money well spent. Or would I be better off to buy something solid but unspectacular for £500?

Or something else completely? Something more practical - perhaps:
http://www.google.co.uk/imgres?hl=en&safe=off&biw=1777&bih=887&tbm=isch&tbnid=PyfRwA2fixFpaM:&imgrefurl=http://www.methodshop.com/2007/10/10-stupid-bike-hacks-pics.shtml&docid=wpmfgY75N9HlMM&imgurl=http://www.wired.com/images/slideshow/2007/10/gallery_bike_hacks/cartbike.jpg&w=580&h=395&ei=t1cQUIbiCKmJ0AWir4DQBA&zoom=1&iact=hc&vpx=162&vpy=143&dur=11933&hovh=184&hovw=271&tx=90&ty=48&sig=105241548934722254904&page=1&tbnh=122&tbnw=160&start=0&ndsp=49&ved=1t:429,r:0,s:0,i:70