I would suggest having the coaches pick the Top 25, but game planning is already time consuming enough, not to mention you would have to vote every 2 days.
Only rule is that you wouldn't be able to vote for a team in your own conference. On the other hand, if that was the case then most people wouldn't even be that interested, since the rankings have no effect with regards to seedings and RPI.
It should be a very simple system, which isn't too complex. W-L record, margin of victory with some consideration to SOS. This really shouldn't be rocket science.