For my 50th birthday, all I wanted was a simple meal home with my lovely wife, nothing else, no fancy fair or big fiesta. And it happened just that way : to me, it's the most prized present I ever had.
Getting back to your asking, just as some fellow bass players already wrote, if you are into the Wal thing, get yourself a Wal, but as Mick said, you won't have it ready for your birthday unless it's a second hand.
Having owned a 4 strings fretless Wal in the 90's (that I sold and bought back twice to finally let it go to a friend who sold it I don't know where, which is a good thing ) and having tried the ACG's, I would say that I prefer the ACG's. The V-shaped neck on the Wal was something really special and the Wal preamp is a bit capricious.
That said, now that I will turn 53 this August, I'm thinking of a Zon Hyperbass II or a Leduc U-Basse 6 strings fretless or a Lefay Remington Steele 6 strings (a unique metal fretboard fretless bass), but even if order one of them today, I won't get it for my birthday.
And yes I'm a fretless man and proud of it.