Is zyxel ok?
I think you will find they are favoured by a lot of people on here. Most of their VDSL modems contain decent BCM chipsets.
The B10-A versions contain the BCM 63168 chip which most rate best for performance.. plus they also have an additional inbuilt noise filter not found in other modems which gives them the edge when it comes to line performance.
Despite me having other modems, the VMG8324 is my modem of choice and I always go back to it. I've recently picked up a VMG8924 which is the same but has dual band 802.11ac.
I remember some of there old post office modems were bad.
Different league. The AMG1302-T10A is an ADSL2 only modem which uses TrendChip chipset.
Do they do anything newer with a good chipset?
Zyxel VMG3925, but it can be hard to get hold of one which isn't locked to an ISP.
I have no personal experience of them, but theres a couple of threads on this forum about them.