Man these prices kill me. Someday, someday I will be able to own an A3000! 
You won't regret it! My only recommendation is try to buy one that has been well used and maintained without battery damage. 3K's tend to fail (something (sadly) I'm way to knowledgeable about) if they are poorly maintained. They don't have the same cap failure rate of the 4000's, 3000 caps were nice ones and I have yet to see one fail. Most 3000's fail from trace problems and next would probably be dead motherboard cpu's.
They are the best designed Amiga IMHO, and have many falsehoods spread about them. The biggest is that they have heat issues, if you replace the pals with gals and keep it clean it will remove heat better than a 4000. My other favorite is that the power supply is too small to run fully populated, makes me laugh every time...
The 3000D's will cost more to buy and the selection of accelerators is limited, compared to the 4000D. Finding a 3000D with all the latest chips in it will be impossible or just ridiculous (unless the owner doesn't realize that Ramsey 7's and DMAC 4's are worth crazy money). But it is the best looking Amiga that to me always was the right size.
Cheers and good hunting.
