The ONLY reason you should hunt down an ATV2 is if you want to jailbreak. You can find ATV2's on ebay for $150+.
If you don't care about jail breaking, get an ATV3. You can get one from Apple refurbished for $85 plus tax with free shipping.
The ATV3 was released over 8 months ago and there are no hints that a jailbreak is forthcoming. It took far less time for the jailbreak to be available for the ATV2. It is possible that the ATV3 simply can't (or "won't") be jailbroken.