I would get rid of any B devices due to the consequences of it's use on the rest of the wireless network.
B's theoretical speed is 11 M realistically it is 4 -5M and will slow EVERYTHING wireless down to the best B speed it can attain. So if you have a N router that can theoretically run 300M but realistically runs at 130M, by using one B device you will be throwing away potentially 125M of throughput, not smart in my book...Just my $.02
Wireless 802.11B cameras are cheap for this very reason, no one is using them and the suppliers need to get rid of them. Some people get huge discounts, some buy it at higher pricers without knowing the repercussions......
This is free advice so take it for what it's worth =)