Better is in the eye of the user. How do you plan to use it? What are your needs. IMHO, you would be better off to get a newer model, 9800, 9810, 9780, 9900, etc.
If you are buying a used one, read this, even if you are not getting it from eBay as it can save you a lot of problems after the purchase: Buying a BlackBerry off eBay - BlackBerryFAQ