In reply to Hat Dude:
> ...slightly more on the bike builder which gives a better range of wheel upgrades.
At the budget you're looking, I'd take time to make sure you get it right. Things like a wheel upgrade may add £100 on first purchase, but if you try to upgrade later, you're looking at £500.
With the planet x link above, also probably worth looking at a wheel upgrade, and you'll still be well within your budget with enough spare for some decent kit and money left over to put towards a holiday on it.