Hi Martin,

I'm no expert, but here's my $.02 worth...  I have had good luck with 
Digium cards.  These days I usually buy the AEX800 w/ HW EC.

> I have been using a TDM400 with 2 FXO cards for over a year but am
> disappointed in the quality.

First off, and don't discount this, make sure the card has its own IRQ. 
  This can be a PITA with cheaper mainboards too.  Try changing slots 
and disabling integrated features you may not need, like serial ports or 
parallel ports or audio hardware, etc.

Use fxotune.  Here's a link:

http://www.voip-info.org/wiki/view/Asterisk+fxotune

Here's another link that may help:

http://www.mattgwatson.ca/2008/05/howto-tune-zaptel-dahdi-fxo-interfaces-on-asterisk-pbx/

IHTH,

G

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