Still using a Billion 8800 nxl - saw them on special around R1200 online recently - there are some newer fancy Asus routers around -but 3x the price.
Not to try and derail from your question - friendly opinion/advice perhaps:
Why change to VDSL?
I found if you have "decent speed" on copper - ie - 12Mb + etc you won't really gain much by going VDSL.
You can get "Theoretical" faster upload speeds -but only slightly - and ONLY if you are very close with perfect copper.
What are your SNR values for down/up?
Does your current router show you any info/statistics of what your attainable rate is on Adsl2+?
There are a number of forums posts on the topic - but just want to a assist from personal experience - Often the expectation is you will see a world of difference when going to VDSL - which is sometime true - say your current exchange doesn't support ADSL2+ - and you are stuck on an older profile or a lot of congestion on the ports - and by some magic you have an exchange that supports VDSL = then perhaps it's worth it. General rule from my person experience is that you gain little if you are on decent ADSL2+ already.
2 cents