Hi Daniel,
A grander entrance area, flower boxes and better front path would probably be your best bang for the buck, and lower the risk by avoiding construction over runs.
Some of my ideas to curb appeal the house (if they make economic sense):
1. Widen the front walk. Set a couple of rows of bricks that match the front step bricks alongside the entry walk on each side. Just set the bricks in a sand base, making the entry sidewalk as wide as the front porch.
2. Remove the screen door (but leave it in the basement for the future owner).
3. Paint the horizontal portion of the rain gutters and the fascia a trendy green.
4. Paint the vertical trim at the edges of the house, as well as the shutters the same trendy green.
5. Paint the front door glossy black.
6. Remove the house numbers from the mailbox and replace them with large trendy looking numbers at an angle above the mailbox.
7. Replace the single front porch light with a light on each side of the door, using lights that have some curb appeal “personality”.
8. Clean the roof stains or replace it, and repaint the foundation.
9. Infill the shrubbery and cut it all to the same size and height.
10. Spray the utility meter to match the background (if they will let you).
Good Luck.