5000:1 is pretty decent for a contrast ratio, you have to see that 90% of the products out there are listing dynamic contrast ratios (the only way they can advertise the absurd 40,000:1 type numbers).
Many LCD monitors now advertise 5,000 - 20,000 contrast ratios (My Samsung 22" for instance lists 3,000:1 rated in dynamic contrast of course).
The true native contrast ratio of these panels range from around 400:1 to (maybe) pushing 1000:1 but those numbers aren't going to sell their product very well.