I use a La Crosse Technology Wireless Data Logger Model WS-8610U-CH
Can recieve info from 3 remote sensors and record 3000 data sets at 5 minutes intervals. It however only does Temp and Humidity. Can download to Excel and it works great. I got mine for about $35.00.
If you want all those bells and whistles, you can buy a 1029 monitor for the low low price of $1500. They sell simple data loggers that are only around $100-$200 that can be plugged into your USB and graphed using an Excel spreadsheet or data logging software.
I have used data loggers in the past for other jobs and you can make some pretty nice looking graphs with the right software.