I'm thinking like Katie on this one Shawna are you updating other areas of the home as well?
For some buyers these doors may actually be a selling feature "local woodworker, hand crafted, vintage to an era, 60's style, etc." For other buyers they may not like them at all.
Changing the doors would certainly update the look and you could always keep the doors in your garage should someone be interested in refinishing them and replacing them back at the front entrance.
Painting/restaining them and replacing the hardware (the handles look worn and is there a mail slot in one of the doors - does it get used?) would be a cost effective option as well. I think the front door is important to make a good first impression and the fact that you have 2 doors makes it even more important.
Good luck!
"There's never a second chance to make a first impression!"