Problems mixing 802.11b/g/n over a WDS link

Continuing to extend the reach of my home network, I did NOT mount a mast on the side of the house an attach a 2Watt omni antenna to get proper WiFi coverage throughout the house ;) I opted to put a 2nd router in the middle of the house, and use WDS to extend the range without needing to re-subnet the whole place. I didn't want two subnets in the same house because the XBox360 uses network broadcasts to communicate with other nodes on the network. Well, I came across one problem with this scheme - my front-end router and my "repeater" router, have different capabilities. One is a b/g compatible LinkSys, the other does b/g/draft-n. It seems they don't play well together when left to their own devices, so I had to limit both to "g" to keep the WDS link stable. Well this worked great, until I tried to use my old 802.11b PCMCIA card in my very old work-supplied Dell laptop. So, I daily chained onto the 2nd WDS router a "client", that client is an old stock MN-700 802.11b/g router - so now I have 3 access points in the house
1 WRT54g running DD-WRT 2.4beta firmware
1 WRT300n running DD-WRT 2.4beta firmware
1 MN-700, running stock MSFT firmware

(SW 02.01.02.0590 / HW 00.00.00.0004)

I'm using the 802.11b link now, and so far it does seem stable. We'll see how it goes.

And yes, the CIFS support *is* exciting ;)