Yah the problem is if I am going to spend $200 I may as well just try to get an Amiga 1200.
A1200s are nice, but so is the A2000 you have. The difference shows up most when playing AGA games and attempting to run WorkBench at more than 16 colors. Any working Amiga (bird in the hand

) is better than taking a chance on eBay. Retargetable Graphics is easy on a 2000. See Mike's post above.

If you search for "SCSI HD, 50-pin", the picking might be better than you think. I have had pretty good luck with Quantum (simple jumper options) drives less than 4 GB in size.
What do want to do with an Amiga?
EDIT: The battery has already been mentioned. I wish I had a dime for every Amiga that was killed by a leaking battery. The coin batteries from AmigaKit have a good reputation. I usually opt for a rechargable cordless phone pack from Radio Shack and mount it away from the motherboard.