5 minutes to bid
Woutsie
This would be a nice option. A person wants to sell a gold hammer, and 5 guys joins the bid-section. The first one bids 3k for it, the other one bids 4k for it, and so on, till the last bidding guy wins and takes the price.
Epinephrine
The ebay system is tried and true. Why mess with a winning formula? If ain't broke, don't fix it.