I've had this router for a while and now have lots of wifi devices all over the house is it possible to get the newest router?
Put simply, No.
Except from Hub 2 to Hub 3.
No Hub seems to have a better Wi-Fi capability than any other Hub.
If you want better Wi-Fi look at investing in third party equipment that is far more powerful than the VM equipment.
I have Hub 3.
Is there a new third party router that's known to work really well with Virgin?
There are many but only you know the ...
Workload the router will have to support.
Have a read of online PC and Networking mags to get an idea.