Greetings, I'm a newbie but have been reading this website for the last couple years and really enjoy the good information provided. Have a three year old Harman XXV stand alone stove in our living room and looking for a used pellet insert for supplemental heat in a small lower level floor fireplace. Considering a used Whitfield Quest WP4 insert for $500 (seller is still looking to verify age of stove) or a used Whitfield Advantage Plus w/ digital controls insert for $800.00 which seller says is from 1996 or 1997. Any suggestions about what stove would be considered to be the better purchase or suggestions for other used insert models to consider for purchase or models that we should steer away from?? Thanks for your consideration.