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Retaining wall replacement

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I have had great success using the helical anchors by mentioned by Chance or by Aluma-Form as tie-backs for retaining walls.  
Another approach you may want to consider is drilling in  cantilever posts at 8' o/c (or longer if core deck is used) with lagging between to retain earth.  Posts can be steel, wood or cast-in-place concrete caissons.  Lagging can be treated wood or pre-cast concrete core deck (or other).  The drilled depth for the posts would be according to your geotechnical engineer.  One advantage is you can have very little disturbance to neighbors, or existing improvements.  Another plus is a short construction time.
With Joy and Hope,
Bob Freeman, Architect
Structural Designer
Integrated Design Services, Inc.
(949) 387-8500