Wireless bandwidth throttling?

[maxedoutcc]

Have a question for you all, im in the works of trying to plan/install a wireless network for a homeowners association. Basically its a townhouse association that wants to split their 6mb/1mb cable internet pipe over a wireless connection to provide wifi to all of the tennants. Im well aware that we are going to come across rf interferance in certain areas but im going to do the best I realistically can.

I have found an inexpensive long range outdoor products from dlink that seem to provide plenty of range. but I fear will lack the requirements I need. it will be <1/8th radius trhat will need coverage. There are 36 townhomes in the development and I figured no more than 50 computers.

My biggest concern is throttling bandwidth so that one person isn't raping the bandwidth.

Ideally what I would like to do is distribute the bandwidth equally amongst the connected computers. i.e... 6 computers connected will result in 1mb of dedicated bandwidth, 12 computers connected will result in 0.5 dedicated.

is this possible?
is there a better way of handling this?
has anyone else setup anything along these lines?
can someone point me in the direction of a forum/group that might be able to help me maybe establish a better foundation that may be needed?

Thanks in advance, B