I've met several Grunheide dogs at obedience trials and schutzhund trials and have been very impressed. The dogs I've met had strong work ethic, athletic structure and seemed environmentally confident/stable. IMHO, this breeder knows dogs and should be able to match you with a suitable pup. Just be sure you explain clearly what you are looking for.
PAM Guardyan's Gavin, VCD2, CDX, RE, AX, AXJ, AXP, AJP, TD
PACH Guardyan's Helki, CDX, PCDX, RA, MXP3, MXPB, MJP3, MJPB, CGCA
Guardyan's Kamikaze BN, CDX, RE, OAP, OJP
Guardyan's Kricket BN, CD, RN, NAP, OJP