Rather than go into full detail here, I will direct you to [url removed, login to view] as what we are looking for as far as exact functions.
Sign up for their free trial and test it out. 30 minutes spent there will show you everything you need to know.
Also intigrate the following function in the software
There is an item you need to have and lots to pick from but only need 1. You set up snipes on 5 of the auctions and as soon as one of them is won, it cancels the remaining qued up snipes.
When looking at this site, think not only of the functions you see but also the web based admin functions to manage this.
Succesful bidder will have extensive knowledge of what it takes to buy on eBay as well as knowledge of eBay API and will be able to show examples of previous eBay related work.
WORKING DEMO MUST BE POSTED BEFORE PAYMENT IS DONE !