If your primary use is going to be a 420 mile trip three times a month you might look at the RV9 or 9A. It designed for cross country flying. Since it has a different wing than 6 or 7 it actually cruises a little faster on less fuel using the IO320. Of course my true preference is the 14 because of the roomier cockpit.
Just a thought.
Jim Harris, RV7A, 2nd owner, N523RM
IO-360, Hartzel CS prop, Older Aerotronics built panel Dual GRT Horizon WS, GRT EIS, Garmin 340, 335, Dual 430s, TruTrak 385 A/P with auto level, FlightBox hard wired to WS, Dynon D10A with internal battery (backup EFIS), 406 MHz ELT.
Retired - Living the dream - And going broke!