Don't get too hung up on getting a bad bike - most of the bikes by major manufactures are of a similar quality for each price band. The Boardman and Allez will be equally good -it's more of which one do you feel is preferable.
That said - the real choice is whether you want an entry level bike with Shimano Sora or perhaps a slightly more expensive model with Shimano Tiagra.
Sorry to confuse matters!
Pretty much sums it up the main difference at this price point will be the shifters and mechs .
Sora = thumb shifter +brake lever which some find hard ( ihave sora on the commuter and it works fine the only ting is to up chnage on the drops you need to move your hand and how often will yu be on the drops ?
tiagra = lever under brake lever + brake lever so you can reach it from hoods + drops
sram = one lever under the brake lever that does both up and down shifts depending how far you push the lever .
microshift= seperate levers for up + downshift, not many people use this but they work and are cheaper than most systems.
EDIT forgot campag, but not many bikes at this price point have them.
Having tried all of these they all work but some people like one or the other