In most cases, you want to use the Repeater Bridge option. This keeps all the systems on the same subnet -- it's basically a range-extender, with the unlikely-to-affect you issues of MAC filtering already raised. You should not bother using MAC filtering as a security measure (it's useless, provides no security compared with WPA and any hacker can spoof a MAC) and virtually no services rely on MAC, because NAT is so prevalent.
A straight repeater creates a separate subnet for clients of the repeater. Doubt that's what you want.
Also, WDS is highly unlikely to work. WDS only works on nearly identical hardware. It sounds like your old router is not the same as your new one. Also WDS is generally just hyper-touchy. It has the benefit of using a single SSID, but I've never seen them work well. They work for a while, then one of the AP's needs to be reset because it fell out of favor with the others.
Repeater-Bridge mode on DD-WRT just work (most of the time -- I've seen it be touchy on some hardware). It's vastly more reliable and hardware ambivalent than WDS.