@adolescent 1st off, congratulations on being a father.
To help with your dilemma, the Amiga 1200 are very easy to find anymore, the Amiga 4000 is more difficult to find however, the Amiga 4000 is worth alot more $$$ than the Amiga 1200 also.
Also, KEEP the Amiga 3000... those are getting rare as well, and you said you bought it new... bottom line is: DON'T GET RID OF IT! :-D