Can anyone recommend an ATA with really good echo cancellation?

My SPA-3000 has never crashed, but echo cancellation has always been a
bit poor (particularly at the remote caller's end), and dependent on
audio gain levels set in the poorly-documented, over-complex web GUI. A
while back I upgraded to the current V3 firmware, which hasn't really
helped. So I wondered whether a more modern ATA box would have better
echo cancellation.

I only need 1*Ethernet port and 1xFXS port, as I have a London 8 PABX
that can be configured as 2+6. But an ATA with 1*Ethernet, 1*FXS, 1*FXO
would be more flexible, if slightly more complex.

What do people reckon to the Cisco ATA 186? I'm used to configuring
Cisco routers and switches, and Cisco kit tends to be very reliable.
Seems to be around the UKP 112 mark.

Also - any comments on the FRITZ!Box Fon ATA? Seems hard to find in the
UK (even from the websites listed on AVM's site as resellers). Has it
been discontinued?

Thanks for any info!

- Martin.