3rd party Ultrachrome K3 inks for 3880 and 7890

[sarnon]

I'm looking to get my printing costs down on my Epson 3880 and 7890 after using Epson OEM ink for the last couple of years. I've researched 3rd party inks and found some with quality/lightfastness that supposedly compares pretty favorably to Epson original. I've also heard that a couple of German manufacturers make the best Ultrachrome K3 compatible pigment inks.

Can anyone give me the name of suppliers of Epson K3 compatible ink (German or otherwise) with which they've had good experiences?

Thanks much in advance.