As a few people have mentioned the Ofna Ultra LX Comp is a decent bashing buggy. I own one and have found it to be very durable. Just make sure you do your research and then get what you feel suits your needs best. Keep in mind the following things.

1) availability of parts
2) plastic pasts vs. aluminum parts
3) What do you intend to do with it
4) how much use will you get out of it

Parts availability and customer support are a huge factor IMO. I'd probably stay away from Ebay for the purchase of the vehicle itself. The reason for this is that there is no customer support and buying from Ebay likely voids the warranty. I have also found that many of the items you see on Ebay are priced higher and have higher shipping than the online hobby shops. Always research the value of items before you bid.

Good luck with whichever buggy you decide to get.