Having both 802.11g and 802.11n devices on a new dual-band AEBS

Although I don't own a dual-band AEBS yet, I'm thinking I might be in the market for one. I just moved into a new apartment complex where the 2.4GHz frequency is saturated with over 30 wireless networks in range of my unit. I'm thinking that the 5GHz frequency would be much less crowded, and am thus considering getting a dual-band AEBS.
I have the following equipment on my home network:
1 Power Mac G5 (uses wired ethernet)
2 MacBooks (use 802.11n)
1 iPhone (uses 802.11g)
1 PlayStation 3 (uses 802.11g)
My question is (and I keep finding conflicting information on this topic) will the iPhone and the PS3 slow down the MacBooks from 802.11n speed to 802.11g speed when they are connected to the dual-band AEBS? If so, can this be avoided by running 2 routers with two separate SSIDs (one in 802.11n only mode, and the other in 802.11g only mode)?
Sorry if this is a repeat question, but the fine print on Apple's product page says that the dual-band AEBS will be slowed down when a 802.11g device joins, but I have heard people say otherwise elsewhere.
Thanks.

So with the new dual-band AEBS, it is possible to create two different SSIDs (one 5GHz 802.11n and one 2.4GHz 802.11g) and have those two networks seamlessly joined for file/printer sharing as well as both run at their maximum speeds.
To the best of my knowledge, being that I just got one a few days ago and haven't "experimented" fully yet, I believe the answer is yes to all counts. I'm sure if others have had the opportunity to check out all of the features that this new model has to offer, they will certainly chime in.

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