here is the info that we discussed:
These are the cameras for the Arena:
http://www.maureenscreations.com/c=3u70Nilm5Yie8PVW6B8Kq4EQk/product/WATERPROOFSONY

I can go with $149.00 each for these

Here are the DVR cards that will go into the computer that you use for the arena:
http://www.maureenscreations.com/c=3u70Nilm5Yie8PVW6B8Kq4EQk/product/DVRCARDUPGRADEABLE

Here is the stand alone DVR I would recommend for your personal use:
http://www.maureenscreations.com/c=3u70Nilm5Yie8PVW6B8Kq4EQk/product/DVR8CD

Here are the wireless cameras:
http://www.maureenscreations.com/c=3u70Nilm5Yie8PVW6B8Kq4EQk/product/WIRELESS12GHZCAM
these are ccd cameras with infrared with 1.2ghz signal. They are rated to go send the signal 700 feet line of sight so I think we will be fine with 300-400 feet that you need.

This is the pricing for the system:
4 cameras for the arena $149.00 x 4 = $596.00
2 DVR cards for the computer $99.00 x 2 = $198.00
DVR 8channel stand alone $999.00
4 1.2ghz wireless cameras $125 x 4 = $500.00
I will offer free shipping for your order.

total for the order: $2293.00