You will need something where both the access point (the first AP) that you will be using the client mode access point up against, and the client mode access point (the second AP) support (the same flavour of) WDS.
My D-Link DWL-G700AP (f/w 2.1 EU) access point in repeater mode (the second AP) can connect by wireless to my Trendnet TEW-510APB (f/w
1.1.2.1 EU) access point using the 2.4 GHz ISM band - the TEW-510APB being a dual band access point - as a client. The DWL-G700AP can also act as a repeater for the TEW-510APB (the first AP) at the same time. Encryption is WPA-PSK (TKIP).
Although the TEW-510APB supports client mode, according to the Trendnet FAQ, it doesn't work with WPA encryption the other way; the with the TEW-510APB (as the second AP) in repeater mode and the DWL-G700AP as an access point (the first AP). But I haven't tried it.
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