In my opinion you shouldn't even bother with IPTV if you're not on at the very least a fibre broadband connection.
IPTV is getting to that stage now where 17mb just won't cut it even on the old SD because you're not getting the full 17mb. if you're lucky you will get around 9-10 add the vpn and that goes down even further and then you now have wife/husband and kids all using the same 10mb connection and people wonder why they have buffering issues.
Let me know if you agree or disagree with this ....
I have customers on 6mb running fine but yes would suggest 10mb at least especially for HAD and to allow other internet connections within the network