If you have the money and you want to do it right, then I would get the best possible black flash cameras in your price range. I would rather have 3 black flash cameras than 4 red IR flash cameras. Generally speaking, deer do not like seeing the red IR flash. There are enough black flash cameras on the market now that the price has dropped a lot in the past year. Some pretty good ones can be had for around $125. That was not the case last year. Black flash really is the way to go if you want to maximize your chances of capturing mature bucks on camera.
Remember - you will also need to spend money on SDHC memory cards and good AA batteries. You will save $ if you get the memory cards from Amazon.com. Get the AA batteries from Amazon.com or Walmart to save $.
For the camera, I would get as many Covert MP6 Black cameras that fit into your budget. Most retail stores are currently charging about $150 + tax for this camera. However, you can get it for less online.
You can get it here for $129 + shipping
Covert MP6 Black Flash Scouting Camera
You can get it on ebay for $125 shipped
Covert MP6 Black
COVERT MP6 BLACK TRAIL CAMERA
Wingsupply.com had the Covert MP6 Black on sale for $120 shipped a few weeks ago, but they sold out heading into Christmas. If you don't plan to buy them right away, then keep checking Wingsupply.com to see if they put them back on sale for $120 when they get in a new shipment of Covert cameras.