Download/Upload Limit with Shaping

Question

I have a network with 8-10 PC's both wireless and wired.
I am looking for an ADSL 2+ Modem with Router that will -
- Designate IP addressess based on MAC addresses.
- Allow me to set a download/upload limit based on amount not speed (ie give everyone 20GB download/upload each month) for each IP Address.
- Allow me to shape the speed if they go over their 20GB limit, so they are not cut off from the internet, but will get a slower speed.
- Has a phone port so an Analog phone can be connected for VOIP, and SIP settings for voip connection. (Not a big requirement)
Does Cisco have any product (Even if it is only a Router) that fully or partially does the above - However it must be able to allocate blocks/amounts of traffic to each IP address on the network, so download/upload limits can be shared equally. (Even if a more expensive router is avaible/designed for larger operation, I would be willing to look at it)
Note I would prefer something where the "firmware" has the necessary options to set the above.
Thank you
John

Answer 1

my signal indicator on the menu bar shows all bars.
As you have probably guessed by now, the "bars" are there pretty much for show, as they tell you very little about the actual strength of your signal, and nothing about the noise.
My Mac is on the floor just above the AP and a total of about 30 feet away.
A typical wall constructed of sheet rock and 2 x 4s in a home will on average, absorb 15-25% of the signal. A ceiling is much thicker, and typically will absorb 45-60% of the signal.
What about different channels, taking it off "automatic" and choosing a particular channel?
The "Automatic" setting will scan all frequencies and select the "best" channel that is available at the time. You can set the channels manually, but which channel to choose? 
You just have to experiment as no particular channel is really "better" than another. It all depends on what channels are in use at any particular time, and that is hard to know, even with good scanning equipment.
A lot of networks are "invisible". You cannot "see" them, so there are more around you than you might think.
Is ridding the house of cordless phones the only answer?
The cordless phones may or may not be causing problems for the wireless network. The only way that you will know is to pick a time when you can turn them and their base stations off for a few hours and then restart your entire network.  Keep an eye on things to see if you notice any difference in performance.
Moving the AP location is not possible, as the cable modem can't be moved.
Perhaps the modem cannot be moved, but you can move the AirPort Extreme anywhere that an Ethernet cable will reach from the modem. You can use virtually any length of cable you want in a home.