Ross, if you can stretch the the Alpine IVE-W535BT, I would recommend it. It has a load of extra useful features over the 530BT. I fitted one last week and it is a great bit of kit. Customer is very chuffed with it. Originally he was going to go with the 530BT, but after I offered the option of the 535BT, he decided he had to have it.
I can do you one for £370 delivered if you're interested?
It will offer perfect integration and display on the MFD which the 530BT won't do, and if you ever upgrade to OPS parking sensors, they will show up on there too. You do need to buy the Alpine adapter though for this.