Rather than worrying about the nearly infinitesimal risk that collision poses I would suggest you concentrate on landings, avoiding controlled flight into terrain and takeoffs. All strangely are almost fully under the control of the pilot and collectively account for just about all accidents in light aircraft.
If you honestly think that a FIS or RIS is going to stop you bumping into someone you are likely to be sadly disillusioned. The vast majority of 'near hits' occur in controlled traffic environments and are usually down to pilots poor situational awareness.
At the end of the day it is VFR
As the others have already piled in - Look out of the windows. After all why else do you fly?
Happy landings