It's worth the lowest price it's available for. Paying £80 more just to have it in your hands a little bit earlier is silly, it's not going to change your life or anything.
I stupidly sold my Galaxy Nexus a few days ago and I missed out on one of the Nexus 4's. When the Nexus 4 goes up on Google Play again, there will be a high demand again and no doubt will sell out. So we could be looking at months before I manage to get my hands on one at the original price.
...This is why I'm contemplating Carphone Warehouse's prices but only the 16gb.
I hate not having a phone.